Wikipedia Scanner -- the brainchild of CalTech 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.

Virgil and his Wikipedia IP Scanner have been covered in Wired.

Threat Level is voting on the best self interested Wikipedia edit.

See Who's Editing Wikipedia - Diebold, the CIA, a Campaign