I am surprised that most of you are not mentioning the size issue. I can afford either camera yet I would never get a 1Ds simply because it is just too big. The 5D is much smaller and is much more of a "buy" for me ... it is almost the size of a 40D. What I hate most about the present day 5D is how dirty the sensor gets. You basically have to clean the sensor every time you go out for a high aperature shoot. I would buy a new 5D in a heartbeat if that alone was "fixed" or improved. Ofcourse Live View and many of the other goodies mentioned would be great too.
