SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13G
                                 (Rule 13d-102)

               INFORMATION TO BE INCLUDED IN THE STATEMENTS FILED
        PURSUANT TO RULES 13d-1(b), (c), and (d) AND AMENDMENTS THERETO
                        FILED PURSUANT TO RULE 13d-2(b)

                               (Amendment No. 2)*

                           Rita Medical Systems, Inc.
                           --------------------------
                                (Name of Issuer)

                    Common Stock, par value $0.001 per share
                    ----------------------------------------
                         (Title of Class of Securities)

                                    76774E-10-3
                                 --------------
                                 (CUSIP Number)

                                December 31, 2005
             -------------------------------------------------------
             (Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

     [ ]  Rule 13d-1(b)

     [X]  Rule 13d-1(c)

     [ ]  Rule 13d-1(d)

*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 the
disclosures provided in a prior cover page.

The information required in 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).

                                  SCHEDULE 13G

CUSIP NO. 76774E-10-3                                               Page 2 of 6
-----------------------------------------------------------------------------
1    NAMES OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (Entities Only)

     Michael A. Roth and Brian J. Stark, as joint filers pursuant to
     Rule 13d-1(k)
-----------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP     (a) [X]
                                                          (b) [ ]
-----------------------------------------------------------------------------
3    SEC USE ONLY

-----------------------------------------------------------------------------
4    CITIZENSHIP OR PLACE OF ORGANIZATION

     United States of America
-----------------------------------------------------------------------------
NUMBER OF      5    SOLE VOTING POWER

SHARES              0
               --------------------------------------------------------------
BENEFICIALLY   6    SHARED VOTING POWER

OWNED BY            2,380,238 shares of Common Stock (See Item 4)
               --------------------------------------------------------------
EACH           7    SOLE DISPOSITIVE POWER

REPORTING           0
               --------------------------------------------------------------
PERSON         8    SHARED DISPOSITIVE POWER

WITH                2,380,238 shares of Common Stock (See Item 4)
-----------------------------------------------------------------------------
9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     2,380,238 shares of Common Stock (See Item 4)
-----------------------------------------------------------------------------
10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

                                                                      [X]
-----------------------------------------------------------------------------
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     5.7% (See Item 4)
-----------------------------------------------------------------------------
12   TYPE OF REPORTING PERSON

     IN
-----------------------------------------------------------------------------

                                  SCHEDULE 13G

CUSIP NO. 76774E-10-3                                               Page 3 of 6

Item 1(a).     Name of Issuer:

               Rita Medical Systems, Inc. (the "Issuer")

Item 1(b).     Address of Issuer's Principal Executive Offices:

               967 N. Shoreline Blvd.
               Mountain View, CA 94043

Items 2(a),
(b) and (c).   Name of Persons Filing, Address of Principal Business Office and
               Citizenship:

               This Amendment No. 2 to Schedule 13G is being filed on behalf of
               Michael A. Roth and Brian J. Stark, as joint filers
               (collectively, the "Reporting Persons").

               The Reporting Persons have entered into a Joint Filing Agreement,
               a copy of which is filed with this Amendment No. 2 to Schedule
               13G as Exhibit 1, pursuant to which the Reporting Persons have
               agreed to file this Amendment No. 2 to Schedule 13G jointly in
               accordance with the provisions of Rule 13d-1(k) of the Securities
               Exchange Act of 1934, as amended.

               The principal business office of the Reporting Persons is 3600
               South Lake Drive, St. Francis, WI 53235. The Reporting Persons
               are citizens of the United States of America.

Item 2(d).     Title of Class of Securities:

               Common Stock, par value $0.001 per share (the "Common Stock")

Item 2(e).     CUSIP Number:

               76774E-10-3

Item 3.        Not applicable

Item 4.        Ownership.

               (a)  Amount beneficially owned:

                    2,380,238 shares of Common Stock*

               (b)  Percent of class:

                    Based on 41,967,768 shares of Common Stock of the Issuer
                    outstanding as of October 31, 2005 (as set forth in the
                    Issuer's 10-Q for the period ended September 30, 2005), the
                    Reporting Persons hold approximately 5.7%* of the issued and
                    outstanding Common Stock of the Issuer.

               (c)  Number of shares to which such person has:

                    (i)   Sole power to vote or direct the vote: 0

                    (ii) Shared power to vote or direct the vote: 2,380,238
                         shares of Common Stock*

                                  SCHEDULE 13G

CUSIP NO. 76774E-10-3                                               Page 4 of 6

                    (iii) Sole power to dispose or to direct the disposition of:
                          0

                    (iv)  Shared power to dispose of or direct the disposition
                          of: 2,380,238 shares of Common Stock*

                    *The Reporting Persons beneficially own an aggregate of
                    2,380,238 shares of Common Stock. The foregoing amount of
                    Common Stock and percentage ownership represent the combined
                    indirect holdings of Michael A. Roth and Brian J. Stark. The
                    shares of Common Stock reported in this Amendment No. 2 to
                    Schedule 13G do not include certain shares of Common Stock
                    issuable upon the exercise of warrants held by the Reporting
                    Persons. Such warrants held by the Reporting Persons are
                    subject to conversion caps that preclude the holder thereof
                    from utilizing its exercise rights to the extent that it
                    would beneficially own (determined in accordance with
                    Section 13(d) of the Securities Exchange Act of 1934) in
                    excess of 4.99% of the Common Stock, giving effect to such
                    exercise.

                    All of the foregoing represents an aggregate of 2,380,238
                    shares of Common Stock held directly by SF Capital Partners
                    Ltd. ("SF Capital"). The Reporting Persons are the Managing
                    Members of Stark Offshore Management, LLC ("Stark
                    Offshore"), which acts as investment manager and has sole
                    power to direct the management of SF Capital. Through Stark
                    Offshore, the Reporting Persons possess voting and
                    dispositive power over all of the foregoing shares.
                    Therefore, for the purposes of Rule 13d-3 under the
                    Securities Exchange Act of 1934, as amended, the Reporting
                    Persons may be deemed to be the beneficial owners of, but
                    hereby disclaim such beneficial ownership of, the foregoing
                    shares.

Item 5.        Ownership of Five Percent or Less of a Class.

               Not applicable

Item 6.        Ownership of More than Five Percent on Behalf of Another Person.

               Not applicable

Item 7.        Identification and Classification of the Subsidiary Which
               Acquired the Security Being Reported By the Parent Holding
               Company.

               Not applicable

Item 8.        Identification and Classification of Members of the Group.

               Not applicable

Item 9.        Notice of Dissolution of a Group.

               Not applicable

                                  SCHEDULE 13G

CUSIP NO. 76774E-10-3                                               Page 5 of 6

Item 10.       Certification.

               By signing below I certify that, to the best of my knowledge and
               belief, the securities referred to above were not acquired and
               are not held for the purpose of or with the effect of changing or
               influencing the control of the issuer of the securities and were
               not acquired and are not held in connection with or as a
               participant in any transaction having that purpose or effect.



                                  SCHEDULE 13G

CUSIP NO. 76774E-10-3                                               Page 6 of 6

                                    SIGNATURE

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

Dated:  February 14, 2006

                                /s/ Michael A. Roth
                                --------------------------------
                                Michael A. Roth


                                /s/ Brian J. Stark
                                --------------------------------
                                Brian J. Stark



                                  SCHEDULE 13G

CUSIP NO. 76774E-10-3

                                                                      Exhibit 1

                             JOINT FILING AGREEMENT

     In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934,
as amended, the undersigned agree to the joint filing on behalf of each of them
of a statement on Schedule 13G (including amendments thereto) with respect to
2,380,238 shares of Common Stock, of Rita Medical Systems, Inc. and further
agree that this Joint Filing Agreement shall be included as an exhibit to such
joint filings.

     The undersigned further agree that each party hereto is responsible for the
timely filing of such Schedule 13G and any amendments thereto, and for the
completeness and accuracy of the information concerning such party contained
therein; provided, however, that no party is responsible for the completeness or
accuracy of the information concerning any other party making the filing, unless
such party knows or has reason to believe that such information is inaccurate.

     IN WITNESS WHEREOF, the parties have executed this Joint Filing Agreement
on February 14, 2006.

                                /s/ Michael A. Roth
                                --------------------------------
                                Michael A. Roth


                                /s/ Brian J. Stark
                                --------------------------------
                                Brian J. Stark