Missed it in the cinema due to circumstances unforeseen, but got my Blu Ray Steelbook (which I thought could have been better) and finally watched it last night.
Completely awesome, does Joss Whedon ever do anything badly?
It's full of classic moments, but for me, as has been mentioned by others, the Hulk gets my three favourite moments;
1 - After Loki taunts him in Starks office, he then proceeds to pummel him from side to side into the floor, walks away and says "Puny God" - best of the film for me...
2 - When the Hulk and Thor are disposing of some bad guys, and then the Hulk put out his left arm and punches Thor away... classic
and
3 - when Bruce Banner returns to the group and Cap mentions it might be a good time for him to get angry, he walks off, says "That's my secret Captain, I'm always angry", then Hulks up and smashes the alien creature...
a close run but also when Loki and Stark talking in his office, Loki "I have an army", Stark "We have a Hulk"... and when Cap is giving his instructions to the team, turns to Hulk and says "Hulk smash"...
Also was waiting for the obligatory cameo from Stan Lee, and had to wait until the end in the news reel clips (or at least I didn't notice him till then), but in the deleted scenes, it seems he was in earlier when he made a comment to Steve Rogers in a sidewalk cafe...
and finally loved the Thanos teaser excerpt during the credits, if he is in the next, I do hope they bring in the Silver Surfer, as he is the coolest character ever...