This is comparable (though less comprehensive) to the Villanova site listed above, but maintains the information in one long list, which you might find easier to browse. (
http://www.lib.lsu.edu/gov/fedgov.html
)
The National Security Archive is an independent non-governmental research institute and library which collects and publishes declassified documents acquired through the Freedom of Information Act. There is a full range of topics covering American foreign, defense, and security policies. This gives you unique insight into the workings of the defense-related agencies of the federal bureaucracy. (
http://www.gwu.edu/~nsarchiv/
)
This is an official government site which allows you to browse, search, and access all Federal Agencies which spend significant amounts of money on generating statistical reports - many do, so do not be surprised at the long list. When you pick an agency, it appears in a separate "frame". Below this is a third frame which lists the statistical topics available; when you select one of these, the main frame takes you to the relevant report. It is a convenient way to do research on different agencies in the bureaucracy. (
http://www.fedstats.gov
)