I got a clear snap-on case from fleabay. Some extraneous plastic 'flash' (for those uinfamiliar with the term, its the bits that are left over when you snip plastic parts from a model kit and other moulding inconsistencies), but they were easily filed off.

Like it a lot - so much so I've bought a couple of spares - doesn't get in the way, doesn't add a lot of bulk, easily removable, dead cheap (Like $3) and provides all the protection I'd reasonably want in terms of everyday abrasion resistance. I have similar cases for the Droid from the same guys, but the design isn't as good.