Uncommon's new Capsule Case for iPhone 4 ($40) builds upon the company's past hard plastic, photo-transferred iPhone and iPod touch cases with some improvements and a few steps backwards. On the plus side, the new Capsule Case is dramatically easier to remove than the original iPhone 3G/3GS version, which nearly required a crowbar to separate from the curved-back iPhones, and it enhances the interior padding found on the original version, too.…