Sold in a matte-finished, soft touch black color with your choice of either white or blue spare slide-on rear compartments, iChair's same-named iChair cases for the iPad ($49) and iPhone 4 ($34) are designed to be durable protectors with built-in stands to keep your device in landscape or portrait viewing modes. The iPad version has twin stands, one capable of rotation, so that you can use the tablet like a keyboard or on your choice of axes, while…