Marvel's latest "motion comic" (think cartoon with the 90's Spider-Man series level of reuse) is an adaptation of Warren Ellis's "Extremis" arc of Iron Man. While pretty much the entire comic community was torn on the impact of the series, I have yet to find someone who didn't actually like the arc itself.
First episode (of 6) is 20 minutes long. Haven't had a chance to watch the entire thing yet (mostly operating based on the trailer http://marvel.com/motion_comics/ ), but it definitely has higher production values than the Spider-Woman motion comic.
Also, it is a Marvel Knights imprint, so think pg-13 to light R as far as ratings go (the MAX imprint is heavy R to light-unrated)
You can get it on Zune, iTunes, and probably some other sources.