I think I only saw about 5 new movies this year, but only 2 worthy of a best-of list:
Iron Man - good dialogue, acting and humanizing plot elements, and the armour was spectacular. Coolest looking suit since Boba Fett.
Dark Knight - very intricate movie, I needed to watch it twice to catch everything, Ledger was mesmerizing, I savoured every inflection. Bale was probably on par with Keanu Reaves .. very utilitarian but no real acting going on.