Ooh... Shiny!
Okay, I'm a little excited about this now...

I decided I liked Robert Downey Jr. after watching him play the magician in "Kiss Kiss Bang Bang" opposite Val Kilmer. So I wasn't opposed to him playing Tony Stark, but I was still afraid that since this was a comic book, the movie might suck. (I love comic books, but it's pretty hit and miss- for every 300 or Batman Begins, there's a 1977 Spiderman, Catwoman, and Electra)
I tracked down the comicon footage, but the sound on it was horrible, so you didn't get the full effect of the trailer. It's awesome. Go, go now, and watch it.