Mr. Virgil Griffith (he is just 24 (or 25) years old) has introduced PMCU tool (Poor Man's CheckUser) and Beaver Scope tool.

http://wikiscanner.virgil.gr/pmcu/

http://wikiscanner.virgil.gr/beaverscope/

Link to Wired's blog entry:
http://blog.wired.com/27bstroke6/2008/07/wikiscanner-cre.html