I'll second the InvisaShield. I have it on my iPod and will be ordering one for my new cell phone in a few weeks. It's really quality stuff and doesn't take away from the iPod's natural beauty.
eh, i like the concept of the invisible shield, I have one. But on the white one it started to look all funky, like dirty all the time, took it off, the thing was really brown and kinda gross. Good thing apple came out with a new version of the 5g ipod and this time i bought it in black...thank you apple..ha!
But on a second note, I went with the clear griffin hard case. works like a charm.