Some federal agencies seem to be putting a number of their documents on www.scribd.com. These are not easily browsable, so you should only use this site if you have some information on what you are looking for, but there may be documents here that do not appear on agency websites. It looks like some heavy users are the DOJ, the Treasury, and the EPA (the EPA has uploaded over 300,000 documents). To find a particular agency’s documents search for a user with its title (the users for those three agencies are DOJ, Treasury, and EPA). Because Scribd actually scans and uploads paper documents for free, this may become a source for many materials like this.
Ernster, the Virtual Library Cat