Remember The Memory Hole
The Memory Hole–dedicated to "rescuing knowledge" and "freeing information" is one of the most fascinating, and relatively underappreciated, sites on the Web.
Think of it as The Smoking Gun for shit that really matters (and that's not meant to disrespect TSG, which is great). Edited by Russ Kick, The Memory Hole posts all kind of stuff that gets pulled off official Web sites or disappears for other reasons (neglect, legal action, etc).
Recent posts include links to the mortuary procedures for dead soldiers returned to Dover Air Force Base, inventories of George W. Bush's gubernatorial papers, and 20 images from the CIA museum "we're not allowed to visit."