My original iPhone died several months ago. The top half of the screen stopped responding to touch. I thought about trying to fix it but AT&T let me get the 3G iPhone for the same price as the repair, $199, without extending my contract.
Someday I'd like to repair it and use it as a DEV iPhone. Just waiting to see what the summer brings...maybe I'll have a reason to upgrade and then the 3G will become the dev iPhone.