I guess the subject says it all. I've read How can I make slit-scan photographs with a dSLR? and I love messing about with slit scan with an app on my iPhone but I want to make one with my Canon 5D Mkii running Magic Lantern. It has been months since I looked at the Magic Lantern Forums and I did't find an answer there.
Here's one I just threw together with my iPhone app.
I'll be spending some bounty points on this, at least 150, maybe 200, I don't want to drop below 4K. (And yes, I'll edit this comment out when I post the bounty.)
Silent Picture
mode it would read out the Liveview frame line by line. This does mean that you were still limited to 1720x974. However I see in the change log that this feature is removed from ML in March 2012 and that you are left with the video method + frame grabbing + still a low resolution. I think the conclusion is that you can't take a high res slit-scan photo with ML.