I saw this last night and was very, VERY impressed. It is too bad that Heath Ledger cannot continue to portray the Joker.
There was a time where I didn't think anyone could best Nicholson's portrayal of the Joker.
I was dead absolute wrong. Ledger's last performance will definitely prove to be his greatest... he captured the masterfully planning yet chaotic insane villain absolutely perfectly. There were points where I was thinking to myself, "The Joker is the most sane person in the whole damn city, even though he is completely batshit fuckin' loco."