UNITED STATES
                     SECURITIES AND EXCHANGE COMMISSION
                           Washington, D.C. 20549

                                SCHEDULE 13D
                              (Amendment No. 6)

                  Under the Securities Exchange Act of 1934

                          NU SKIN ENTERPRISES, INC.
                              ----------------
                               (Name of Issuer)

                   Common Stock, Par Value $.01 Per Share
                        -----------------------------
                         (Title of Class of Securities)

                                  67018T105
                                  ----------
                                 (CUSIP Number)

                              Gregory D. Hitchan
                          Blum Capital Partners, L.P.
                       909 Montgomery Street, Suite 400
                            San Francisco, CA 94133
                                (415) 434-1111
                                --------------
                   (Name, Address and Telephone Number of Person
                    Authorized to Receive Notices and Communications)

                                March 22, 2007
                                --------------
               (Date of Event which Requires Filing of this Statement)


If the filing person has previously filed a statement on Schedule 13G to
report the acquisition which is the subject of this Schedule 13D, and is
filing this schedule because of Rule 13d-1(b)(3) or (4), check the
following box [ ].

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities,
and for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the Notes).


                                 Page 1 of 12

                                    *****

CUSIP NO. 67018T105              SCHEDULE 13D                    Page 2 of 12

-----------------------------------------------------------------------------
 1.  NAME OF REPORTING PERSON                     BLUM CAPITAL PARTNERS, L.P.

     I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY)     94-3205364
-----------------------------------------------------------------------------
 2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                (a) [x]
                                                                      (b) [x]
-----------------------------------------------------------------------------
 3.  SEC USE ONLY

-----------------------------------------------------------------------------
 4.  SOURCE OF FUNDS*                                              See Item 3

-----------------------------------------------------------------------------
 5.  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
     PURSUANT TO ITEMS 2(d) or 2(e)                                       [ ]
-----------------------------------------------------------------------------
 6.  CITIZENSHIP OR PLACE OF ORGANIZATION                          California

-----------------------------------------------------------------------------
                    7.  SOLE VOTING POWER                                 -0-

   NUMBER OF       ----------------------------------------------------------
   SHARES           8.  SHARED VOTING POWER                       4,755,900**
   BENEFICIALLY
   OWNED BY EACH   ----------------------------------------------------------
   PERSON WITH      9.  SOLE DISPOSITIVE POWER                            -0-

                   ----------------------------------------------------------
                   10.  SHARED DISPOSITIVE POWER                  4,755,900**

-----------------------------------------------------------------------------
11.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,755,900**

-----------------------------------------------------------------------------
12.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
     CERTAIN SHARES                                                       [ ]
-----------------------------------------------------------------------------
13.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)                7.2%**

-----------------------------------------------------------------------------
14.  TYPE OF REPORTING PERSON                                          PN, IA

-----------------------------------------------------------------------------
** See Item 5

                                    *****

CUSIP NO. 67018T105              SCHEDULE 13D                    Page 3 of 12

-----------------------------------------------------------------------------
 1.  NAME OF REPORTING PERSON              RICHARD C. BLUM & ASSOCIATES, INC.

     I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY)     94-2967812
-----------------------------------------------------------------------------
 2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                (a) [x]
                                                                      (b) [x]
-----------------------------------------------------------------------------
 3.  SEC USE ONLY

-----------------------------------------------------------------------------
 4.  SOURCE OF FUNDS*                                              See Item 3

-----------------------------------------------------------------------------
 5.  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
     PURSUANT TO ITEMS 2(d) or 2(e)                                       [ ]
-----------------------------------------------------------------------------
 6.  CITIZENSHIP OR PLACE OF ORGANIZATION                          California

-----------------------------------------------------------------------------
                    7.  SOLE VOTING POWER                                 -0-

   NUMBER OF       ----------------------------------------------------------
   SHARES           8.  SHARED VOTING POWER                       4,755,900**
   BENEFICIALLY
   OWNED BY EACH   ----------------------------------------------------------
   PERSON WITH      9.  SOLE DISPOSITIVE POWER                            -0-

                   ----------------------------------------------------------
                   10.  SHARED DISPOSITIVE POWER                  4,755,900**

-----------------------------------------------------------------------------
11.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,755,900**

-----------------------------------------------------------------------------
12.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
     CERTAIN SHARES                                                       [ ]
-----------------------------------------------------------------------------
13.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)                7.2%**

-----------------------------------------------------------------------------
14.  TYPE OF REPORTING PERSON                                              CO

-----------------------------------------------------------------------------
** See Item 5

                                    *****

CUSIP NO. 67018T105              SCHEDULE 13D                    Page 4 of 12

-----------------------------------------------------------------------------
 1.  NAME OF REPORTING PERSON                   BLUM STRATEGIC GP III, L.L.C.

     I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY)     04-3809436
-----------------------------------------------------------------------------
 2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                (a) [x]
                                                                      (b) [x]
-----------------------------------------------------------------------------
 3.  SEC USE ONLY

-----------------------------------------------------------------------------
 4.  SOURCE OF FUNDS*                                              See Item 3

-----------------------------------------------------------------------------
 5.  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
     PURSUANT TO ITEMS 2(d) or 2(e)                                       [ ]
-----------------------------------------------------------------------------
 6.  CITIZENSHIP OR PLACE OF ORGANIZATION                            Delaware

-----------------------------------------------------------------------------
                    7.  SOLE VOTING POWER                                 -0-

   NUMBER OF       ----------------------------------------------------------
   SHARES           8.  SHARED VOTING POWER                       4,755,900**
   BENEFICIALLY
   OWNED BY EACH   ----------------------------------------------------------
   PERSON WITH      9.  SOLE DISPOSITIVE POWER                            -0-

                   ----------------------------------------------------------
                   10.  SHARED DISPOSITIVE POWER                  4,755,900**

-----------------------------------------------------------------------------
11.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,755,900**

-----------------------------------------------------------------------------
12.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
     CERTAIN SHARES                                                       [ ]
-----------------------------------------------------------------------------
13.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)                7.2%**

-----------------------------------------------------------------------------
14.  TYPE OF REPORTING PERSON                  OO (Limited Liability Company)

-----------------------------------------------------------------------------
** See Item 5

                                    *****

CUSIP NO. 67018T105              SCHEDULE 13D                    Page 5 of 12

-----------------------------------------------------------------------------
 1.  NAME OF REPORTING PERSON                     BLUM STRATEGIC GP III, L.P.

     I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY)     02-0742606
-----------------------------------------------------------------------------
 2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                (a) [x]
                                                                      (b) [x]
-----------------------------------------------------------------------------
 3.  SEC USE ONLY

-----------------------------------------------------------------------------
 4.  SOURCE OF FUNDS*                                              See Item 3

-----------------------------------------------------------------------------
 5.  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
     PURSUANT TO ITEMS 2(d) or 2(e)                                       [ ]
-----------------------------------------------------------------------------
 6.  CITIZENSHIP OR PLACE OF ORGANIZATION                            Delaware

-----------------------------------------------------------------------------
                    7.  SOLE VOTING POWER                                 -0-

   NUMBER OF       ----------------------------------------------------------
   SHARES           8.  SHARED VOTING POWER                       4,755,900**
   BENEFICIALLY
   OWNED BY EACH   ----------------------------------------------------------
   PERSON WITH      9.  SOLE DISPOSITIVE POWER                            -0-

                   ----------------------------------------------------------
                   10.  SHARED DISPOSITIVE POWER                  4,755,900**

-----------------------------------------------------------------------------
11.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,755,900**

-----------------------------------------------------------------------------
12.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
     CERTAIN SHARES                                                       [ ]
-----------------------------------------------------------------------------
13.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)                7.2%**

-----------------------------------------------------------------------------
14.  TYPE OF REPORTING PERSON                                              PN

-----------------------------------------------------------------------------
** See Item 5

                                    *****

CUSIP NO. 67018T105              SCHEDULE 13D                    Page 6 of 12

-----------------------------------------------------------------------------
 1.  NAME OF REPORTING PERSON               BLUM STRATEGIC PARTNERS III, L.P.

     I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY)     04-3809438
-----------------------------------------------------------------------------
 2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                (a) [x]
                                                                      (b) [x]
-----------------------------------------------------------------------------
 3.  SEC USE ONLY

-----------------------------------------------------------------------------
 4.  SOURCE OF FUNDS*                                              See Item 3

-----------------------------------------------------------------------------
 5.  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
     PURSUANT TO ITEMS 2(d) or 2(e)                                       [ ]
-----------------------------------------------------------------------------
 6.  CITIZENSHIP OR PLACE OF ORGANIZATION                            Delaware

-----------------------------------------------------------------------------
                    7.  SOLE VOTING POWER                                 -0-

   NUMBER OF       ----------------------------------------------------------
   SHARES           8.  SHARED VOTING POWER                       4,755,900**
   BENEFICIALLY
   OWNED BY EACH   ----------------------------------------------------------
   PERSON WITH      9.  SOLE DISPOSITIVE POWER                            -0-

                   ----------------------------------------------------------
                   10.  SHARED DISPOSITIVE POWER                  4,755,900**

-----------------------------------------------------------------------------
11.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,755,900**

-----------------------------------------------------------------------------
12.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
     CERTAIN SHARES                                                       [ ]
-----------------------------------------------------------------------------
13.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)                7.2%**

-----------------------------------------------------------------------------
14.  TYPE OF REPORTING PERSON                                              PN

-----------------------------------------------------------------------------
** See Item 5

                                    *****

CUSIP NO. 67018T105              SCHEDULE 13D                    Page 7 of 12

-----------------------------------------------------------------------------
 1.  NAME OF REPORTING PERSON                 SADDLEPOINT PARTNERS GP, L.L.C.

     I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY)     83-0424234
-----------------------------------------------------------------------------
 2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                (a) [x]
                                                                      (b) [x]
-----------------------------------------------------------------------------
 3.  SEC USE ONLY

-----------------------------------------------------------------------------
 4.  SOURCE OF FUNDS*                                              See Item 3

-----------------------------------------------------------------------------
 5.  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
     PURSUANT TO ITEMS 2(d) or 2(e)                                       [ ]
-----------------------------------------------------------------------------
 6.  CITIZENSHIP OR PLACE OF ORGANIZATION                            Delaware

-----------------------------------------------------------------------------
                    7.  SOLE VOTING POWER                                 -0-

   NUMBER OF       ----------------------------------------------------------
   SHARES           8.  SHARED VOTING POWER                       4,755,900**
   BENEFICIALLY
   OWNED BY EACH   ----------------------------------------------------------
   PERSON WITH      9.  SOLE DISPOSITIVE POWER                            -0-

                   ----------------------------------------------------------
                   10.  SHARED DISPOSITIVE POWER                  4,755,900**

-----------------------------------------------------------------------------
11.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,755,900**

-----------------------------------------------------------------------------
12.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
     CERTAIN SHARES                                                       [ ]
-----------------------------------------------------------------------------
13.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)                7.2%**

-----------------------------------------------------------------------------
14.  TYPE OF REPORTING PERSON                  OO (Limited Liability Company)

-----------------------------------------------------------------------------
** See Item 5

                                    *****

CUSIP NO. 67018T105              SCHEDULE 13D                    Page 8 of 12

Item 1.  Security and Issuer
-----------------------------

This Amendment No. 6 amends the Statement on Schedule 13D (the "Schedule 13D")
filed with the Securities and Exchange Commission (the "Commission") on
March 15, 2007 by Blum Capital Partners, L.P., a California limited
partnership, ("Blum LP"); Richard C. Blum & Associates, Inc., a California
corporation ("RCBA Inc."); Blum Strategic GP III, L.L.C., a Delaware limited
liability company ("Blum GP III"); Blum Strategic GP III, L.P., a Delaware
limited partnership ("Blum GP III LP"); Blum Strategic Partners III, L.P., a
Delaware limited partnership ("Blum Strategic III")and Saddlepoint Partners
GP, L.L.C., a Delaware limited liability company ("Saddlepoint GP")
(collectively, the "Reporting Persons").

This amendment relates to shares of Class A common stock, $.001 par value per
share (the "Common Stock") of Nu Skin Enterprises, Inc., a Delaware
corporation (the "Issuer"). The principal executive office and mailing address
of the Issuer is 75 West Center Street, Provo, UT 84601.

The following amendments to the Schedule 13D are hereby made. Unless otherwise
defined herein, all capitalized terms shall have the meanings ascribed to them
in the Schedule 13D.


Item 2.  Identity and Background
---------------------------------

There have been no changes to Item 2 since the last Schedule 13D Amendment
filed on March 15, 2007.


Item 3.  Source and Amount of Funds or Other Considerations
------------------------------------------------------------

There have been no changes to Item 3 since the initial Schedule 13D filed on
December 15, 2005.


Item 4.  Purpose of Transaction
--------------------------------

There have been no changes to Item 4 since the initial Schedule 13D filed on
December 15, 2005.

                                    *****



CUSIP NO. 67018T105              SCHEDULE 13D                    Page 9 of 12

Item 5.  Interest in Securities of the Issuer
----------------------------------------------

(a), (b) According to the Issuer's Form 10-K filed with the Commission on
March 1, 2007, there were 65,878,613 shares of Common Stock issued and
outstanding as of February 15, 2007.  Based on such information, after taking
into account the transactions described in Item 5(c) below, the Reporting
Persons report beneficial ownership of the following shares of Common Stock:
(i) 1,022,610 shares of Common Stock held by Blum LP and RCBA Inc. on behalf
of the limited partnerships for which Blum LP serves as the general partner,
which represents 1.6% of the outstanding shares of the Common Stock; (ii)
3,444,290 shares of the Common Stock held by Blum GP III which serves as
general partner of Blum GP III LP which, in turn, serves as the general
partner of Blum Strategic III, which represents 5.2% of the outstanding shares
of the Common Stock; (iii) 167,600 shares of the Common Stock held by
Saddlepoint GP on behalf of a partnership for which it serves as the general
partner, which represents 0.3% of the outstanding shares of the Common Stock;
and (iv) 60,700 shares of the Common Stock that are legally owned by The
Nuclear Decommissioning Trust of Dominion Nuclear Connecticut, Inc. ("Dominion
Connecticut"), which represents 0.1% of the outstanding shares of the Common
Stock and 60,700 shares of the Common Stock that are legally owned by Virginia
Electric and Power Company Qualified Nuclear Decommissioning Trust ("Virginia
Electric"), which represents 0.1% of the outstanding shares of the Common
Stock (collectively, the "Investment Advisory Clients"), with respect to which
Blum LP has voting and investment power.  Each Investment Advisory Client has
entered into an investment management agreement with Blum LP, but neither
Investment Advisory Client has any contract, arrangement or understanding with
the other Investment Advisory Client, or any other Reporting Person, with
respect to the acquisition, ownership, disposition or voting of any shares of
the Common Stock.  Each Investment Advisory Client disclaims membership in a
group with any Reporting Person or with the other Investment Advisory Client,
and each disclaims beneficial ownership of any shares beneficially owned by
the Reporting Persons other than for their own account.

Voting and investment power concerning the above shares are held solely by
Blum LP, Blum GP III and Saddlepoint GP.  The Reporting Persons therefore may
be deemed to be members in a group, in which case the group would be deemed to
have beneficial ownership of an aggregate of 4,755,900 shares of the Common
Stock, which is 7.2% of the outstanding Common Stock.  As the sole general
partner of Blum LP, RCBA Inc. is deemed the beneficial owner of the securities
over which Blum LP has voting and investment power.  The filing of this
Schedule shall not be construed as an admission that any of the shareholders,
directors or executive officers of RCBA Inc. or the managing members and
members of Blum GP III, Blum GP III LP and Saddlepoint GP, is, for any
purpose, the beneficial owner of any of the securities that are beneficially
owned by RCBA Inc., Blum LP, Blum GP III LP, Blum GP III or Saddlepoint GP.

                                    *****



CUSIP NO. 67018T105              SCHEDULE 13D                   Page 10 of 12

c) Since the most recent filing of Schedule 13D, the Reporting Persons
sold the following number of shares of Common Stock in the open market:


Entity                             Trade Date    Shares    Price/Share
-------                            ----------   --------   -----------
Investment partnerships for        03-15-2007     8,700        16.6100
which Blum LP serves as the        03-15-2007     2,900        16.6492
general partner.                   03-16-2007     2,200        16.5200
                                   03-16-2007    10,700        16.5484
                                   03-19-2007    29,500        16.5471
                                   03-19-2007     8,700        16.5950
                                   03-20-2007     6,700        16.5500
                                   03-20-2007    15,000        16.5623
                                   03-21-2007     6,400        16.6300
                                   03-21-2007    34,900        16.7796
                                   03-22-2007    23,800        16.7086
                                   03-22-2007     5,500        16.6820
                                   03-23-2007    33,400        16.7181
                                   03-23-2007    19,600        16.7262


Entity                             Trade Date    Shares    Price/Share
-------                            ----------   --------   -----------
For Blum Strategic III for         03-15-2007    28,900        16.6100
which Blum GP III LP               03-15-2007    10,310        16.6492
serves as the general partner      03-16-2007     7,200        16.5200
and for Blum GP III which          03-16-2007    35,400        16.5484
serves as the general              03-19-2007    99,500        16.5471
partner for Blum GP III LP.        03-19-2007    28,900        16.5950
                                   03-20-2007    21,400        16.5500
                                   03-20-2007    51,700        16.5623
                                   03-21-2007    21,700        16.6300
                                   03-21-2007   118,000        16.7796
                                   03-22-2007    80,700        16.7086
                                   03-22-2007    18,000        16.6820
                                   03-23-2007   112,400        16.7181
                                   03-23-2007    66,100        16.7262

                                    *****



CUSIP NO. 67018T105              SCHEDULE 13D                   Page 11 of 12

Entity                             Trade Date    Shares    Price/Share
-------                            ----------   --------   -----------
The partnership for which          03-15-2007     1,400        16.6100
Saddlepoint GP serves as           03-15-2007       500        16.6492
general partner.                   03-16-2007       400        16.5200
                                   03-16-2007     1,700        16.5484
                                   03-19-2007     4,900        16.5471
                                   03-19-2007     1,400        16.5950
                                   03-20-2007     1,100        16.5500
                                   03-20-2007     2,500        16.5623
                                   03-21-2007     1,100        16.6300
                                   03-21-2007     5,700        16.7796
                                   03-22-2007     3,900        16.7086
                                   03-22-2007       900        16.6820
                                   03-23-2007     5,500        16.7181
                                   03-23-2007     3,200        16.7262


Entity                             Trade Date    Shares    Price/Share
-------                            ----------   --------   -----------
The Investment Advisory            03-15-2007     1,000        16.6100
Clients for which Blum LP          03-15-2007       400        16.6492
serves as investment advisor.      03-16-2007       200        16.5200
                                   03-16-2007     1,400        16.5484
                                   03-19-2007     3,600        16.5471
                                   03-19-2007     1,000        16.5950
                                   03-20-2007       800        16.5500
                                   03-20-2007     1,800        16.5623
                                   03-21-2007       800        16.6300
                                   03-21-2007     4,200        16.7796
                                   03-22-2007     2,800        16.7086
                                   03-22-2007       600        16.6820
                                   03-23-2007     4,000        16.7181
                                   03-23-2007     2,200        16.7262


(d) and (e)  Not applicable.


Item 6.  Contracts, Arrangements, Understandings or Relationships with
Respect to Securities of the Issuer
--------------------------------

There have been no changes to Item 6 since the initial Schedule 13D filed on
December 15, 2005.


Item 7.  Material to be Filed as Exhibits
------------------------------------------

Exhibit A - Joint Filing Undertaking

                                    *****

CUSIP NO. 67018T105              SCHEDULE 13D                    Page 12 of 12


                                  SIGNATURES

After reasonable inquiry and to the best of our knowledge and belief, the
undersigned certify that the information set forth in this statement is true,
complete and correct.


Dated:  March 26, 2007

RICHARD C. BLUM & ASSOCIATES, INC.    BLUM CAPITAL PARTNERS, L.P.
                                      By: Richard C. Blum & Associates, Inc.
                                          Its General Partner



By: /s/ Gregory D. Hitchan            By: /s/ Gregory D. Hitchan
    -------------------------------      -----------------------------------
    Gregory D. Hitchan                    Gregory D. Hitchan
    Partner, Chief Operating Officer,     Partner, Chief Operating Officer,
    General Counsel and Secretary         General Counsel and Secretary



BLUM STRATEGIC GP III, L.L.C.         BLUM STRATEGIC GP III, L.P.
                                      By:  Blum Strategic GP III, L.L.C.
                                           Its General Partner





By: /s/ Gregory D. Hitchan              By:  /s/ Gregory D. Hitchan
     -------------------------------    ------------------------------------
     Gregory D. Hitchan                 Gregory D. Hitchan
     Managing Member                    Managing Member


BLUM STRATEGIC PARTNERS III, L.P.      SADDLEPOINT PARTNERS GP, L.L.C.
By:  Blum Strategic GP III, L.P.,      By:  Blum Capital Partners, L.P.
     Its General Partner                    Its Managing Member
By:  Blum Strategic GP III, L.L.C.     By:  Richard C. Blum & Associates, Inc.
     Its General Partner                    Its General Partner


By:  /s/ Gregory D. Hitchan            By: /s/ Gregory D. Hitchan
    ----------------------------           ------------------------------
     Gregory D. Hitchan,                    Gregory D. Hitchan
     Managing Member                        Partner, Chief Operating Officer,
                                            General Counsel and Secretary

CUSIP NO. 67018T105              SCHEDULE 13D                      Page 1 of 1


                                  Exhibit A
                           JOINT FILING UNDERTAKING

The undersigned, being duly authorized thereunto, hereby execute this
agreement as an exhibit to this Schedule 13D to evidence the agreement of the
below-named parties, in accordance with the rules promulgated pursuant to the
Securities Exchange Act of 1934, to file this Schedule jointly on behalf of
each such party.

Dated:  March 26, 2007

RICHARD C. BLUM & ASSOCIATES, INC.    BLUM CAPITAL PARTNERS, L.P.
                                      By: Richard C. Blum & Associates, Inc.
                                          Its General Partner



By: /s/ Gregory D. Hitchan            By: /s/ Gregory D. Hitchan
    -------------------------------      -----------------------------------
    Gregory D. Hitchan                    Gregory D. Hitchan
    Partner, Chief Operating Officer,     Partner, Chief Operating Officer,
    General Counsel and Secretary         General Counsel and Secretary



BLUM STRATEGIC GP III, L.L.C.         BLUM STRATEGIC GP III, L.P.
                                      By:  Blum Strategic GP III, L.L.C.
                                           Its General Partner





By: /s/ Gregory D. Hitchan              By:  /s/ Gregory D. Hitchan
     -------------------------------    ------------------------------------
     Gregory D. Hitchan                 Gregory D. Hitchan
     Managing Member                    Managing Member


BLUM STRATEGIC PARTNERS III, L.P.      SADDLEPOINT PARTNERS GP, L.L.C.
By:  Blum Strategic GP III, L.P.,      By:  Blum Capital Partners, L.P.
     Its General Partner                    Its Managing Member
By:  Blum Strategic GP III, L.L.C.     By:  Richard C. Blum & Associates, Inc.
     Its General Partner                    Its General Partner


By:  /s/ Gregory D. Hitchan            By: /s/ Gregory D. Hitchan
    ----------------------------           ------------------------------
     Gregory D. Hitchan,                    Gregory D. Hitchan
     Managing Member                        Partner, Chief Operating Officer,
                                            General Counsel and Secretary