Are you looking for scratch protection or impact protection?
If you're looking for scratch protection, try a skin from
Decalgirl. I've got one on my Pocket Edge, and it works great. If you go for the matte option, it hides fingeprints and make the device less slippery and easier to hold. I was going to get one for my A100, but since my foray into GPS navigation, I decided on a case/stand instead.