Like the larger version for the iPod classic, Speck's ToughSkin for iPod nano 3G ($25) is a modern-looking firm rubber case with a detachable hard plastic screen protector. The third-generation nano's face and bottom ports and controls are exposed, but ToughSkin instead doubles up on the protection of the nano's corners and sides. Black and clear frosted versions are available; unlike the iPod classic edition, this one doesn't include a belt clip.…
