It actually would with most cases, but I don't see the need to buy full body coverage if you're going to use a case. From a practical perspective, it's really a waste of money unless you're really OCD about keeping your phone in mint condition.
Seriously. If you're going to be that anal about your phone, wait for the Otterbox to come out. Those suckers have a thin plastic layer, a thick plastic layer and then a soft rubber layer on the outside.