The end of this week has brought with it quite a few unique spins on familiar styles of cases, so Logitech's Fold-Up Keyboard for iPad 2 ($130) fits right in by standing out. Unlike most of the keyboard cases we have seen -- including the company's earlier Keyboard Case -- the keyboard here is not limited to the length of the iPad 2. Instead, Logitech employs a keyboard that folds out. When it's not in use, the keyboard fits under the plastic shell…
