Saw the movie yesterday. It was a solid entry, definitely better than 2.
Kind of spoilerish below...
It would be crazy, but I'd really like them to stick to the idea that Tony Stark was done with the Iron Man suit. After all, the point of the movie was that the suit was a "cocoon", and that it was his mechanic's mind that was important. So the next movie could prove it by having him build something that is a quantum leap beyond the suit in terms of coolness.
The best part of Iron Man 1 for me was that apart from the arc reactor, you could kind of believe that building a suit like that may be possible. With this movie, there are aspects that are entirely unbelievable. But I guess the cat's out of the bag as of the Avengers.