iSkin Duo is one of the better protective skins for the iPod Nano. These skin cover your Nano with a thin, powder-coated layer that mimics the metallic look of the Nano.The iSkin will add only about 1.65mm to it's size. It has features an inner silicone layer that is specially treated to resist dust and lint. It also covers the clickwheel protecting against moisture damage and wear. You can find them here at Amazon
(Meticulously filed under: iPod Accessories) with one eye twitching.