The Congressional Research Service has put out a useful and concise summary of federal programs that provide direct and indirect incentives for biofuels. The report lists over eighteen active programs administered by five different agencies including the U.S. Department of Agriculture; Department of Energy and Internal Revenue Service. For each program, the report lists the authorizing legislation, the annual funding, the expiration date and the targeted beneficiaries of the programs.
A copy of the report can be found at http://www.stoel.com/files/R40110.pdf.
A special thanks to Penny Hill Press for making this report available.