Trading on the name of the company's previous, protective cases for the iPhone and iPhone 3G, Case-Mate's new Naked Case for iPod nano 4G ($20) is a clear hard plastic shell with integrated screen coverage, but no included Click Wheel protector -- a surprise given the company's typically comprehensive approach to protecting iPods' faces. The two-piece shell slides open on the back to let you insert the nano, and frames part of its face with a ring…
