Exhibit 8.1
                                                                     -----------




                        [LETTERHEAD OF McKee Nelson LLP]








                                  May 22, 2006

Annaly Mortgage Management, Inc.
1211 Avenue of the Americas
Suite 2902
New York, New York 10036

       Re: Registration Statement on Form S-3

Ladies and Gentlemen:

       Annaly Mortgage Management, Inc., a Maryland corporation (the "Company"),
has requested our opinion  concerning certain tax matters in connection with the
registration  statement on Form S-3 (the "Registration  Statement") filed by the
Company with the Securities and Exchange  Commission under the Securities Act of
1933, as amended through the date hereof.  Capitalized terms used herein and not
otherwise defined have the meanings set forth in the Registration Statement.

       This  opinion is based,  in part,  upon various  assumptions  and factual
representations  set  forth  in  the  Registration  Statement  and  in a  letter
delivered  to us by the  Company  today.  This  opinion  is also  based upon the
Internal Revenue Code of 1986, as amended (the "Code"), the Treasury Regulations
promulgated thereunder, and existing administrative and judicial interpretations
thereof,  all as they  exist at the date of this  letter.  All of the  foregoing
statutes,  regulations,  and  interpretations  are  subject to  change,  in some
circumstances with retroactive effect. Any changes to the foregoing  authorities
might result in modifications of our opinions contained herein.

       In addition,  as counsel to the Company,  we have  examined and relied on
the originals or copies,  certified or otherwise identified to our satisfaction,
of such  instruments,  certificates,  records,  and other documents that we have
deemed appropriate for purposes of rendering our opinion. In our examination, we
have assumed the legal capacity of all natural  persons,  the genuineness of all
signatures,  the authenticity of all documents submitted to us as originals, the
conformity to original  documents of all documents  submitted to us as certified
or photostatic copies or by facsimile or other means of electronic  transmission
or which we obtained from the Commission's  Electronic Data Gathering,  Analysis
and  Retrieval  System  ("EDGAR")  or  other  sites  on the  internet,  and  the
authenticity of the originals of such latter documents.





Annaly Mortgage Management, Inc.
May 22, 2006
Page 2


       Based on the foregoing,  we are of the opinion that,  commencing with the
Company's  taxable year ended  December 31, 1997,  the Company has been and will
continue to be organized in conformity with the requirements  for  qualification
and taxation as a real estate investment trust (a "REIT") under the Code and its
method  of  operating  has  enabled  the  Company,  and its  proposed  method of
operating going forward will enable the Company,  to meet the  requirements  for
qualification and taxation as a REIT.

       The  Company's  qualification  as a REIT  will  depend  on the  Company's
meeting, in its actual operations,  the applicable asset composition,  source of
income, shareholder diversification,  distribution and other requirements of the
Code and Treasury  Regulations  necessary  for REIT  qualification.  We will not
review these operations and no assurance can be given that the actual operations
of  the  Company  and  its  affiliates  will  meet  these  requirements  or  the
representations made to us with respect thereto.

       This  opinion is  furnished  to you for your use in  connection  with the
Registration  Statement.  We hereby  consent  to the  filing of this  opinion as
Exhibit 8 to the Registration Statement and to the use of our name in connection
with the  material  discussed  therein  under the  caption  "Federal  Income Tax
Considerations"  in the  prospectus or any  supplement  thereto.  In giving this
consent, we do not hereby admit that we are within the category of persons whose
consent  is  required  under  Section 7 of the  Securities  Act or the rules and
regulations of the Commission promulgated thereunder.

                                                       Very truly yours,

                                                       /s/ McKee Nelson LLP