I just discovered Cox&Forkum, a site for editorial cartoons by Cox and Allen Forkum. The cartoons are currently about the war with Iraq—isn't everything focused on that right now?—but that would probably change as time goes on.
You may know of Allen Forkum as the artist behind the new covers of Ayn Rand's books.
[UPDATE (9/11/03): Larry reminded me that Nick Gaetano is the artist for Ayn Rand's books. Looking back over my memory, Allen Forkum was the cartoonist for a long-defunct Objectivist publication called Reality. Incidentally, those bums never refunded my subscription when they went under.]