... Robert Downey Jr.
http://movies.msn.com/movies/article.aspx?news=236219
I'm going to go out on a limb and say that while I wouldn't have thought of him out of the clear blue, I think it's a good fit: what better actor is there to play Tony Stark, famous for his substance abuse problems?

Yes, this actually hit two or three days ago, but I didn't see anything when I searched, so if this is a dupe ... my bad.
http://movies.msn.com/movies/article.aspx?news=236219
I'm going to go out on a limb and say that while I wouldn't have thought of him out of the clear blue, I think it's a good fit: what better actor is there to play Tony Stark, famous for his substance abuse problems?

Yes, this actually hit two or three days ago, but I didn't see anything when I searched, so if this is a dupe ... my bad.