With all the complaints we heard after the iPhone 4 launched with its signal-squeezing metal frame, it's surprising that anyone would think of wrapping it in yet another layer of metal. Yet here we are, staring at the Case-Mate Titanium iPhone Case ($300). This precision-machined case is made from a single piece of titanium and matches the curves of the iPhone 4 perfectly — the fit is so tight, in fact, that minor assembly is required. Bet you can't say that about your current rubber case.