The Canon 7D has been a tough nut to crack for the Magic Lantern firmware crew. After 3 years in the process, they finally had a breakthrough and figured out how to run Magic Lantern as add-on software on the 7D.
Check out the video below for a demo of Magic Lantern running on the 7D.[youtube http://www.youtube.com/watch?v=9R-teVHSdtk&w=640&h=360]
The Magic Lantern team is currently working on the debug process to get the firmware in a state for release. You can read more and donate to the cause here at Magic Lantern’s website.