Using soft, deliberately weathered brown leather on the outside and a more conventional suede-like microfiber inside, United SGP's new Vintage Edition Leather Case for Apple iPad ($73) is one of the nicest-looking leather cases we've yet seen for the iPad, though also one of the least protective of its sides, top, and bottom, exposing metal on every edge. The case flips open to reveal the iPad on the right side of its frame, and uses a relatively…