Mophie/mStation has introduced two new cases for the iPhone 3G and second-generation iPod touch, along with a new case for the fourth-generation iPod nano. The Hardcase and Hardcase Plus for iPhone 3G and iPod touch 2G are both made from high-quality clear polycarbonate and feature a two-piece snap together design as well as open access to all ports and controls. While the Hardcase offers open access to either devices’ screen, the Hardcase…