Well, there is Magic Lantern for the 5D2 (and most modern Canon DSLRs); there also exists 400plus for the 400D, and there is some work in progress for the 5D classic here.
That's the Ticket!!!
I hadn't seen Magic Lantern. It looks promising. Too bad they don't have it for 7D (redheaded stepchild of canon dslrs).
extended bracketing, trap focus, motion detection or very long exposures
COOL!