Unlike any other case we've yet seen for the iPhone, Artwizz's SeeJacket Crystal for Apple iPhone (approx. $30) uses a two-piece clear hard plastic shell not just to cover the iPhone's body, but also its entire screen. The thickness of the front shell is designed to permit use of the iPhone's touch-sensitive controls, and holes are cut out for the device's Home button, ear speaker, and proximity sensor, as well as its full bottom, and all the necessary…