I didn't want to come into this thread until I saw the movie afraid someone would spoil something...
Watched it in iMax yesterday. I really enjoyed the plot. There was a time when I thought it was about to end at the Two-face climax, but then it kept going. IMO, they should have just ended it there and started off the second movie with Two-face as the main enemy, and then the Joker coming back for a second climax in the movie. Obviously, that would be difficult because of Ledger. If they do make a second one, I think the role of the joker has officially been re-defined thanks to Ledger, and because of this I'd like to see Johnny Depp as the Joker.