Saw it at last night's midnight showing and enjoyed it throughly. Ledger's performance as Joker was deserving of all the praise it has been getting. It is disappointing that they can no longer have a Joker in the Batman films, because I do not see Ledger's performance being topped, at least not a long time.
(SPOILER)As far as Two-Face being dead, I highly doubt it. Joker and Two-Face are the core Batman villains and without them, the Bat is nothing. Minor villains can be introduced but you cannot make a movie out of them unless they somehow included Ra's al Ghul and the league of shadows again. I took the final funeral scene as more of a "death of Harvey Dent" rather than death of the character all together. Two-Face lives as far as I'm concerned. He is too great of a villain to die from a fall such as that.