Presidential Transitions: Background and Federal Support [Updated February 11, 2008] [open pdf - 67KB]
From the Summary: "The Presidential Transition Act (PTA), as amended, authorizes funding for the General Services Administration (GSA) to provide suitable office space, staff compensation, and other services associated with the transition process. Section 5 of the PTA authorizes the President to include in his budget request for each fiscal year in which his regular term of office will expire, a proposed appropriation for carrying out the purposes of the act. The President's FY2009 budget requests $8,520,000 in funding for the upcoming presidential transition. Of this total, $1 million is provided for briefings and related transition services for incoming personnel associated with the new administration."
CRS Report for Congress, RS20709