The Iron Man trailer/teaser was leaked by Apple! It wasn't supposed to be available till later today but I guess it doesn't matter now. At least the trailer is more interesting than the Dark Knight trailer/teaser.
When Tony Stark is forced to create a life support suit to keep him alive after an accident he decides to use the technology in his suit to fight crime.
If you want to watch the trailer in higher quality, visit Apple's website.
[Link: Iron Man at IMDB]