This page contains serveral links that help calculating PSEs.
General
FAS Budget Division
Current dps and loan payments by commodity
ERS Domestic Support
The ERS site on domestic support
ERS PSEs 82-92
Old producer support estimates by ERS
WTO notifications,
Agricultural database for WTO notifications
U.S. Price Support Reports
FAS Reports on price support
Agriculture OECD
Agricultural site at OECD with links to support info
OECD method
Paper describing the methodology in estimating PSEs
RMA Crop insurance
Data on crop insurance from Risk Management Agency
Application
Summary Business Applet with crop/state/year data on crop insurance