See Who's Editing Wikipedia

http://www.wired.com/politics/onlinerights/news/2007/08/wiki_tracker
Wikipedia Scanner -- the brainchild of Cal Tech computation and neural-systems graduate student Virgil Griffith -- offers users a searchable database that ties millions of anonymous Wikipedia edits to organizations where those edits apparently originated, by cross-referencing the edits with data on who owns the associated block of internet IP addresses.


Wikipedia Scanner


Wikipedia Scanner exposes self-edits in online encyclopedia
San Francisco (IDGNS) - A word of caution about editing entries "anonymously" in Wikipedia: a tool has been developed that can show who made the changes.


Virgil Griffith