What they don't want you to know.

A site linking to results from a special Wikipedia search. It's a cross reference between the IP addresses of anonymous edits to Wikipedia against the edits that were made. People are using it to find organizations editing their own information. The link above can link you to the search engine, but it contains many juicy finds itself, which you can click on to see the diffs of the Wikipedia pages.
Some good stuff in there, Exxon declaring the Valdez disaster harmless, Scientology cleaning up it's image, McDonalds removing criticisms, Diebold, Republicans, Democrats, Digital Rights Management, Israelis, Mulsims, etc.