Available in black, blue, pink, or white, PDO's TopSkin for the third-generation iPod nano ($15) is a relatively straightforward silicone case. Like TopSkin for iPod touch, it includes a clear film screen protector that fills a screen-sized hole in its rubber body, and uses a thin layer of rubber to protect the iPod's front controls. The iPod nano version leaves the nano's whole bottom exposed, rather than using flip-open flaps like the touch and…
