On the surface, Targus's new Truss Case for iPad ($50) looks sort of like a "me too" alternative to the many folios and flip cases we've already seen for Apple's tablet computer, but its appeal is in the details: professional-looking real leather on the outside, contrast stitched to match the color of the soft blue inner lining, which has far more padding than we've seen on earlier, similar products. The iPad-holding right frame can be locked into…