That apparent Cap "cameo" in the alternate Hulk opening is pretty cool. I just really like how Marvel is tying their movies together into one universe, its really too bad that Sony and Fox have the strangleholds on the Spidey and X-Men rights, respectively. It would be nice to see more cameos and crossovers in future movies, if it all works out well.
I didn't get a chance to see the Incredible Hulk this summer, but I heard good things so I grabbed the DVD yesterday at Target - looking forward to catching it this weekend. I really hope that Thor, Cap, and the Avengers all live up to the quality of Iron Man and (apparently) Hulk. I'm really anticipating that Captain America movie, hopefully they do it justice.