I've seen it twice now... loved it.
So many homages to the comics and the television show.
I loved Iron Man also, and while Stark's "tech-tinkering" made the other movie more "fun" (as did Stark's "fly-by-the-seat-of-his-pants" mentality), this movie (and Norton) portrayed Bruce Banner's tortured existence spot-on as well.
(Yeah, as others pointed out as well.. my one gripe is his scars not healing. I was watching the film yesterday, staring
at the (relatively large) scars on him waiting for them to close up and heal, and they didn't. Really a minor gripe,
though.)
The "Hulk Smash" scene and the thunderclap he does brought nothin' but smiles to my face.
I teared up a little too... great movie, overall. Iron Man didn't have the emotional weight this movie possesses (but then, Stark's "love interest" in the movie isn't a love interest at all, and Bruce has Betty).