iSkin has introduced its new line of cases for the Apple iPad. Made from Microban-enhanced silicone, the Duo is a low-profile case featuring side grips for better handling, push-through protection for the volume, home, and sleep buttons, and a front-facing black screen frame. It comes in seven colors and sells for $50. The Vu is a hybrid case offering both soft and hard plastic components, a rear bottom hatch that can be removed for docking, recessed…