I'm willing to throw my little pocket change of REP at anyone who can point me toward a resource where I can look up a particular character name to see if it is already being used by an established comic company, etc.
There's nothing like sweating over a name for your game only to have a player say, "Oh, yeah, you must have gotten (fill in your cool name here) from the that old Atlas Comics where they blah blah blah."
Of course, there's nothing new under the sun, but I'd love to be able to find out with a couple of clicks if something is already "taken" in a meaningful way. I mean, if there's no one stop shopping for my pop-culture needs, what in the hell is the 'Net good for...
(I've already used Google & Wikipedia, but there's got to be something out there specifically for this!)
RIP (Restless in Pieces),
CorPse