As the latest of several waterproof cases recently released for the iPhone 4, InnoPocket's Amphibian ($30) utilizes a two-in-one design that shifts between everyday use and full-fledged waterproof protection. The base is a clear polycarbonate plastic shell with back, side, and front protection that can be used independently of the waterproof elements: two additional plastic back plates that attach to one another with two screws to form an airtight…
