Apparently Robert Downey Jr. will be portraying Iron Man on the big screen, according to Cinescape (http://www.cinescape.com/0/editorial.asp?aff_id=0&this_cat=Movies&action=page&type_id=&cat_id=270338&obj_id=52380#). I imagine playing an alcoholic shouldn't be that much of a stretch for him, with his history of substance abuse. He is a descent actor, so we'll see. What do you comic book guys think? I didn't read comics much growing up, so I'm not qualified to have an opinion on this.
Hard to say really, won't he be spending a great deal of time just providing an enhanced voice over for a CG tin man?