Green Power has rolled out a sliding speaker for iPods, offering a touch of class to your iPod nano and iPod touch since both devices do not come with built-in speakers unlike the iPhone 3GS. This more or less makes it a portable dock, although you won’t be able to bring the house down with its twin 1.5W speakers. A miniUSB port allows you to juice up the device, where a full charge ought to last up to 12 hours of non-stop playback. You can choose from a crystal hard case or half-mirror designs as well as a variety of colors. No idea on pricing or availability though.