Some website that I forgot which one it was pointed to this design for a Batmobile by noted sci-fi/horror artist H.R. Giger which was intended for (but not used in) the 1994 film Batman Forever. That whole Batmobile history site is pretty awesome. Be careful, though, I've lost entire workdays browsing it.
And this has nothing to do with anything, really, but Isla Fisher is a lovely woman who dressed up as Catwoman for Halloween, so here's some pictures of that.
After The Scarecrow, Ra's Al Ghul, The Joker, and Two-Face, who should be Batman's next enemy in the Batman Begins/The Dark Knight series? Well, as of now we know that Tom Hardy will play Bane and Anne Hathaway will play Catwoman.
Check out the master list for all the villains covered. I've pretty much run out by now. Obviously, there are more Batman villains, but not any of significance that I know of. As of February 2009, no one is confirmed as a villain. Not the Johnny Depp Riddler, not Phillip Seymour Hoffman Penguin, nobody.