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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549



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FORM 10-K/A

(Amendment No. 1)



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(Mark One)

|x | ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|- | ------------------------------------------------------------------------------------

For the fiscal year ended December 31, 2006

OR



| ̈ | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|- | ----------------------------------------------------------------------------------------

For the transition period from  to

Commission file number: 1-14998



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ATLAS PIPELINE PARTNERS, L.P.

(Exact name of registrant as specified in its charter)



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|                                                              |  |                                    
|------------------------------------------------------------- |  | -----------------------------------
|DELAWARE                                                      |  | 23-3011077                         
|(State or other jurisdiction ofincorporation or organization) |  | (I.R.S. EmployerIdentification No.)



|                                           |  |           
|------------------------------------------ |  | ----------
|311 Rouser RoadMoon Township, Pennsylvania |  | 15108     
|(Address of principal executive office)    |  | (Zip code)

Registrants telephone number, including area code: (412) 262-2830

Securities registered pursuant to Section 12(b) of the Act:



|                                                        |  |                                          
|------------------------------------------------------- |  | -----------------------------------------
|Title of each class                                     |  | Name of each exchange on which registered
|Common Units representing Limited Partnership Interests |  | New York Stock Exchange                  

Securities registered pursuant to Section 12(g) of the Act:

None

(Title of class)



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Indicate by
check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes ̈No  x

Indicate by check mark if the registrant is not
required to file reports pursuant to Section 13 or Section 15(d) of the Act.    Yes ̈No  x

Indicate by check mark whether the registrant
(1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and
(2) has been subject to such filing requirements for the past 90 days.    Yes  x    No ̈

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of
Regulation S-K is not contained herein, and will not be contained, to the best of registrants knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form
10-K. ̈

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer. See definition of accelerated filer and large accelerated filer in Rule 12b-2 of the Exchange Act
(Check one):

Large accelerated filer ̈Accelerated filer  x    Non-accelerated filer ̈

Indicate by check mark whether the registrant is a shell company (as
defined in Rule 12b-2 of the Act).    Yes ̈No  x

The aggregate market value of the equity securities held by non-affiliates of the registrant, based upon the closing price of
$40.91 per common limited partner unit on June 30, 2006, was approximately $468.0 million.

DOCUMENTS INCORPORATED BY REFERENCE:
None



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Explanatory Note

This Form 10-K/A is being filed to amend our Annual Report on Form 10-K for the period ended December 31, 2006, as filed with the Securities and Exchange Commission on March 14, 2007 (the Original
Filing), for the purpose of adding to PART II, Item 9A, Controls and Procedures the conclusions of our principal executive and principal financial officers regarding the effectiveness of our disclosure controls and procedures.
No other information in Item 9A has been modified pursuant to this amendment.

Except for the item described above, no other
information in the Original Filing is amended hereby, and this amendment does not reflect events occurring after the Original Filing or modify or update those disclosures affected by subsequent events. Accordingly, this Form 10-K/A should be read in
conjunction with our filings with the Securities and Exchange Commission subsequent to the Original Filing.



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|ITEM 9A. | CONTROLS AND PROCEDURES
|-------- | -----------------------

Conclusion Regarding
the Effectiveness of Disclosure Controls and Procedures

We maintain disclosure controls and procedures that are designed to ensure
that information required to be disclosed in our Securities Exchange Act of 1934 reports is recorded, processed, summarized and reported within the time periods specified in the SECs rules and forms, and that such information is accumulated
and communicated to our management, including our General Partners Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure. In designing and evaluating the disclosure
controls and procedures, our management recognized that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives, and our management necessarily was
required to apply its judgment in evaluating the cost-benefit relationship of possible controls and procedures.

Under the supervision of
our General Partners Chief Executive Officer and Chief Financial Officer and with the participation of our disclosure committee appointed by such officers, we have carried out an evaluation of the effectiveness of our disclosure controls and
procedures as of the end of the period covered by this report. Based upon that evaluation and the identification of the material weaknesses in internal control over financial reporting described below, our General Partners Chief Executive
Officer and Chief Financial Officer concluded that, as of December 31, 2006, our disclosure controls and procedures were not effective at the reasonable assurance level.

Managements Report on Internal Control over Financial Reporting

The
management of our General Partner is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in Exchange Act Rules 13a-15(f). Under the supervision and with the participation of
management, including our General Partners Chief Executive Officer and Chief Financial Officer, we conducted an evaluation of the effectiveness of internal control over financial reporting based upon criteria set forth by the Committee of
Sponsoring Organizations of the Treadway Commission in Internal Control  Integrated Framework (COSO framework).

An effective
internal control system, no matter how well designed, has inherent limitations, including the possibility of human error and circumvention or overriding of controls and therefore can provide only reasonable assurance with respect to reliable
financial reporting. Furthermore, effectiveness of an internal control system in future periods cannot be guaranteed because the design of any system of internal controls is based in part upon assumptions about the likelihood of future events. There
can be no assurance that any control design will succeed in achieving its stated goals under all potential future conditions. Over time certain controls may become inadequate because of changes in business conditions, or the degree of compliance
with policies and procedures may deteriorate. As such, misstatements due to error or fraud may occur and not be detected.

Our
managements assessment of the effectiveness of internal control over financial reporting as of December 31, 2006 has been audited by Grant Thornton LLP, an independent registered public accounting firm, as stated in their report which is
included herein. Based on our evaluation under the COSO framework, management concluded that our internal control over financial reporting as of December 31, 2006 was ineffective because it identified a material weakness with regard to our
accounting for certain derivative instruments in accordance with Statement of Financial Accounting Standards No. 133, Accounting for Derivative Instruments and Hedging Activities (SFAS No. 133). Specifically, we
entered into a significant number of option instruments (a combination of puts purchased and calls sold that are commonly known as costless collars) in September 2006 to hedge our exposure to movements in commodity prices that were not



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appropriately valued within our consolidated financial statements under the provisions of SFAS No. 133. While the costless collars were valued
appropriately with regard to their intrinsic value, we did not record a fair value for the time-value component of the derivative instruments. All of our other derivative instruments that were in effect during 2006 have been appropriately recorded
within our consolidated financial statements. This material weakness resulted in the amendment of our Form 10-Q as of September 30, 2006.

Subsequent to our discovery of the material weakness discussed above, in early 2007 we took steps to remediate the material weakness, including reviewing the accounting requirements necessary for compliance with SFAS No. 133 and
establishing additional review procedures of accounting for derivative transactions by senior personnel within our organization. We believe these actions will strengthen our internal control over financial reporting and address the material weakness
identified.

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

Board of Directors and Unitholders

Atlas Pipeline Partners, L.P.

We have audited managements assessment, included in the accompanying Managements Report on Internal Control Over Financial Reporting, that Atlas Pipeline
Partners, L.P. (the Partnership) (a Delaware limited partnership) did not maintain effective internal control over financial reporting as of December 31, 2006, because of the effect of a material weakness identified in
managements assessment related to the effectiveness of internal controls pertaining to the accounting for certain financial hedge instruments,based on criteria established in Internal Control  Integrated Framework issued by the
Committee of Sponsoring Organizations of the Treadway Commission (COSO)). The Partnerships management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of
internal control over financial reporting. Our responsibility is to express an opinion on managements assessment and an opinion on the effectiveness of the Partnerships internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we
plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial
reporting, evaluating managements assessment, testing and evaluating the design and operating effectiveness of internal control, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit
provide a reasonable basis for our opinions.

A partnerships internal control over financial reporting is a process designed to provide reasonable
assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A partnerships internal control over financial reporting
includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the partnership; (2) provide reasonable
assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the partnership are being made only in accordance
with authorizations of management and directors of the partnership; (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or dispositions of the partnerships assets that could have a
material effect on the financial statements.

Because of the inherent limitations, internal control over financial reporting may not prevent or detect
misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may
deteriorate.



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A material weakness is a control deficiency, or combination of control deficiencies, that result in more than a remote
likelihood that a material misstatement of the annual or interim financial statements will not be prevented or detected. The following material weakness has been identified and included in managements assessment:

A material weakness with regard to the Partnerships accounting for certain derivative instruments in accordance with Statement of Financial
Accounting Standards No. 133, Accounting for Derivative Instruments and Hedging Activities (SFAS No. 133). Specifically, the Partnership entered into a significant number of option instruments (a combination of
puts purchased and calls sold that are commonly known as costless collars) in September 2006 to hedge its exposure movements in commodity prices that were not appropriately valued within its consolidated financial statements under the
provisions of SFAS No. 133. While the costless collars were valued appropriately with regard to their intrinsic value, the Partnership did not record a fair value for the time-value component of the derivative instruments.

This material weakness was considered in determining the nature, timing, and extent of the audit tests applied in our audit of the 2006 financial
statements, and this report does not affect our report dated March 9, 2007,which expressed an unqualified opinion on those financial statements.

In our opinion, managements assessment that Atlas Pipeline Partners, L.P. did not maintain effective internal control over financial reporting as of December 31, 2006, is fairly stated, in all material respects, based on the
criteria established in Internal Control  Integrated Framework issued by COSO. Also, in our opinion, because of the effect of the material weakness described above on the achievement of the objectives of the control criteria, Atlas Pipeline
Partners, L.P. has not maintained effective internal control over financial reporting as of December 31, 2006, based on the criteria established in Internal Control  Integrated Framework issued by COSO.

We express no opinion on the steps taken by management in early 2007 to remediate the identified material weaknesses.



|                      
|----------------------
|/s/ GRANT THORNTON LLP
|                      
|Cleveland, Ohio       
|March 9, 2007         



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SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.



|                 |  |                               |  |                                                     
|---------------- |  | ----------------------------- |  | ----------------------------------------------------
|                 |  | ATLAS PIPELINE PARTNERS, L.P.
|                 |  | By:                           |  | Atlas Pipeline Partners GP, LLC, its General Partner
|                 |  |                              
|November 8, 2007 |  | By:                           |  | /s/ EDWARD E. COHEN                                 
|                 |  |                               |  | Chairman of the Managing Board                      



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