They said it couldn't be done but ML is now available for the 7D
http://www.magiclantern.fm/whats-new...alpha-released

It's the first alpha so I haven't put it on my camera yet, but I did update my official firmware to 2.03. One problem I had was I couldn't copy any files to the CF card when the camera was connected to my laptop (I don't have an external reader), I had to use the Eos utility.

I think the problem is I'm using Win 7 64 bit. Has anyone manage to copy files to their camera card when it's been in the camera with Win 7 64 bit?