Just to throw this out there, there is a lot of talk on #wikipedia about asking developers to identify IPs to identify sock puppets of trolls. I recognize the privacy concerns of Wikipedia. I propose a solution:

http://usemod.com/cgi-bin/mb.pl?NetworkDistance

Thanks to TimStarling, Hephaestos, pakaran, and jeronim for sounding it out. You know who you are.

SS