Ruggedized cases are usually overengineered and not especially easy to look at, adding bulk without improving the appearance. Gumdrop Cases has released a new take on the genre, and it's different in a good way. Drop Series Case for iPad 2 ($60) is not only super protective because of its multilayer design, but it looks pretty neat too: the tablet fits directly into a rigid plastic shell, with a removable, replaceable screen cover over the display.…