If you appreciate the artwork that appears in 2 player fighting games (Street Fighter, King of Fighters etc) then you'll absolutely love this site. In fact, they have a profile on EVERY fighting game character around! 639 characters! In every profile, you get tonnes of drawings, sketches, in-game shots, and sprite character animations ripped out of the games themselves!!
I'm not sure if this is all done by one guy, but it is one immensely gigantic gallery of great game art. I must say that Capcoms art far supercedes the others in this area, so be sure to check out all their Street Fighter characters first. :) I love it. This is what the whole intermanet thingy is all about... check it out here.