MANY thanks to Dan Berger for sharing this with me. I'll post it just as he sent it to me:

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What it is, is a site (setup up by a 24 year old Grad student) to link anonymous wikipedia edits with the organizations "owning" the IP ranges from which the edits where made. Even though we've probably suspected it, this data-mining project lifts the curtain on that fact that organizations are doctoring their wikipedia entries. What I am fascinated by is the fact that it does lift the curtain so that companies can no longer hide behind anonymity when "white washing" their entries.
Enjoy,
Dan

The wikiscanner search engine that "reveals all"
http://wikiscanner.virgil.gr/

A "best of list" from Wired Magazine
http://wired.reddit.com/wikidgame/

An example:  Diebold attempting to wipe out references to security
issues with voting machines. (theirs!)
http://en.wikipedia.org/w/index.php?diff=prev&oldid=28623410