xyzzy123 sez, "Want to make a freedom-of-information request to the FBI or other three-letter agencies for any information they might have about you? This post links to a website that lets you enter personal information (or not, if you prefer), and then automatically print form letters to the correct government offices."
The incident that precipitated the article is pretty bizarre: a woman with a history of protest asked the FBI for her file and discovered that she'd been closely followed. What's more, she learned that despite all that close surveillance, the FBI got her political allegiances completely wrong, describing bitter rivals as fellow travelers and generally getting it all messed up.
Life Get Your FBI File! (Thanks, xyzzy123!)