Haha I JUST made a thread about this in the sequels forum.
I don't think Thor will be a main focus in Iron Man 2. I think we'll be sitting around til after the end credits for Thor's intro.
It's just going to be a cameo guys. Stop freaking out over nothing. Hell, I wouldn't be surprised if it's no more than a random appearance by a guy named Donald Blake.
You guys are acting like Thor was just annoucned to be like the second lead character in the film or something. Like he'll be stealing screentime from Tony or will have a subplot of his own or something.
Seriously, chill out.
Ok, hold on a second man. No one's thinking Thor is the #2 character in the sequel. We're just saying: given that there is the "Marvel Universe", but also considering how Favreau has steeped the film in realism, how do they plausibly fit in Thor?