I've unwittingly scratched mine on the Motorola logo on the back; I put a metal plate on the inside of the case and it was rubbing without my realizing it. Nuts.

Also, somehow, there's a scratch on the external screen. I don't recall dropping it in a way that would scratch that screen, but it's there. Arg. I have a crappy film screen protector, but I was waiting to pick up a glass one. Advice: get some kind of protector on there stat.