Incase has announced its first cases for the iPhone 3G. The Leather Folio for iPhone 3G is made from genuine Nappa leather and ballistic nylon, and features custom suede interior lining, velcro closures, and will be available with a belt clip in select colors. Incase’s Leather & Neoprene sleeves will offer form-fitting construction in either leather or neoprene, direct access to the iPhone’s screen, ports, and controls, and will allow…