GENERAL AND MISCELLANEOUS
National Archives Exhibit Hall. You can find the Declaration of Independence and other historical exhibits here.
Superintendent of Documents in the Government Printing Office.
General Service Administration: GSA's Government Information Exchange
Library of Congress homepage.
National Science Foundation's homepage.
The U.S. Postal Service's Postal Bulletin
Post Office: Zip code lookups
Mailbox Map: A Google Maps Mash-up to find Postal Boxes in your neighborhood
U.S. Consumer Product Safety Commission