Available in either black or purple, Incase's new Grip Protective Cover for iPad ($40) is the company's second precision-molded rubber case for the iPad -- and like the standard Protective Cover, it's impressively, perfectly fit to the iPad's curves and holes. The Grip Protective Cover has bumps on the back that aid in gripping the iPad, sort of like the "game controller" cases that companies including Incase released for the iPod touch and iPhone,…