I'm not normally one for linking (and I almost posted this to SeeBelow, but first, it's cool instead of lame, and second, for all I know, comics nerds all know about this already), but I found this pretty fucking great:
http://www.lambiek.com/artists/index.htm It's a "comiclopedia" sponsored by a Dutch comic shop -- a VERY comprehensive, A-to-Z index of notable comic artists and writers complete with pretty detailed biographies, examples of their work, and links to their websites where applicable. Useful stuff.
(Shout out to my rooms
thaitea, who found the thing.)