First off, there's "Iron Man: Extremis" by Warren Eliis and Adi Granov, a motion comic. What is a motion comic, you ask? Well, grandpa, it's a 3D animated version of a comic book with audio and a few special effects. It is available in six, twenty-minute episodes on iTunes, Zune, or X-Box Live. Check out the trailer for Marvel's third motion comic. The talking heads are a wee bit hokey, I would LOVE to see Terry Gilliam comics available this way... Also in hard copy.
Scarlett's character gets her own comic book, too. "Black Widow" by Marjorie Liu and Daniel Acuna is a new series for the lady spy that has been featured in many Marvel dude comics.
If you've been following the old Iron Man comics, you know what's up. "Invincible Iron Man 25" is a special edition of the periodical out now for the movie. By Matt Fraction.
"Iron Man Legacy" is a new series that launched in April by Fred Van Lente and Steve Kurth.
"Iron Man 2: Public Identity" by Joe Casey, Justin Theroux and Barry Kitson is a comic for those that want to know exactly what happened between the first movie and the second movie.
Littler kids might dig:
"Iron Man: I Am Iron Man" an I Can Read Book Level 2 by Lisa Rao, illustrated by Guido Guidi
A board book, "Super Hero Squad: Iron Man Springs Into Action!" by Kirsten Mayer
And for middle graders who want some super main characters, I know I've mentioned both of these before, but STILL, if you haven't picked them up yet:
"Candle Man: Book 1 The Society of Unrelenting Vigilance" by Glenn Dakin (out in paperback in a few weeks!)
"The Rise of Renegade X" by Chelsea Campbell (which just came out on May 11)