If you just want something simple that prevents you from scuffing the back cover and corners of your iPod touch, then the Griffin Wave is a great choice. It’s a duarable polycarbonate cover for your phone that slides on from the top and bottom, locking together to create the ‘wave effect’ on the back. It includes a screen protector and leaves all buttons, dock connector and headphone socket exposed.

Griffin Wave for iPod touch 2G