UPDATE: My 7D is no longer accepting firmware updates, which means that unfortunately I have been locked out of further development on the camera. Until I find a workaround, I've shifted work to the 5D Mark 2 and 550D.
This demonstrates the first steps to getting Magic Lantern running on the Canon 7D. It is not very interesting yet since I don't have all of the internals sorted out. The boot process takes a very long time since the Canon firmware is verifying the SHA1 signature of the entire flasher program, which is pretty slow on the ARM9. This will hopefully speed up once we're able to either enable autobooting from the CF card or bypass the signature checks.
For more info: magiclantern.wikia.com