Picking up on one of the long-standing fan favorite iPod case manufacturing techniques, Billet Proof Cases has unveiled the Machined Aluminum Case for 3G iPhone ($90-$100), a two-piece shell that's machine-sculpted from a block of aluminum, then sanded, polished, and in some cases anodized. While the basic version of the case has a brushed aluminum finish, three more deluxe versions are offered in chrome, red, or black colors; all come with four screws…
