Sidekicks, by Allan Heinberg and Jim Cheung (2006).
I picked this book up solely because I wanted to catch myself up on the Young Avengers storyline, so I could read the Civil War Young Avengers/Runaways crossover.
And now, I kind of have a thing for teenage superheroes. This is no Runaways, by any means, but it's pretty enjoyable. Witty dialogue, awesomely huge fight scenes, appearances by Iron Man and Captain America, subtle but unmistakable references to a couple of the characters being gay--all of these things are positives as far as I'm concerned. The art in this book is fantastic as well. Wiccan is really hot.
I'm such a fangirl.