Winner of our 2011 Best of Show Award for its outstandingly elegant design, Just Mobile's new Slide ($40) is billed as a "portable playground for iPad" -- a highly elegant travel-ready stand for Apple's tablet computers. Combining a perfectly weighted rubber and metal cylinder with an angled aluminum stand that's small enough to toss into any bag, including the black one Just Mobile packs in, Slide enables you to easily adjust the viewing angle of…