Using a design borrowed from its earlier Protective Cover for iPhone, Incase's new Protective Cover for iPod nano ($TBD) covers the third-generation iPod nano's top, sides, back, and front edges with a semi-flexible rubber that's been molded with rear topographic lines. The nano's face and bottom are left entirely open for access to the screen, controls, and bottom ports. Multiple colors approximate those of the new nanos; the red, blue, and green…