Green power has outed the GP 400n sliding speaker case for the iPod nano. This includes its own 600 mAh battery and a miniusb charging port. The 1.5W speakers can give you 12 hours of continuous playback.
While the reports also list another version for iPod touch, the touch 2G, and 3G have inbuilt speakers as of now. Wonder if this supports the iPod nano 5G as the specs page on the Green Power only lists the 4G. Would love it if the speakers were a little more sleek to compliment the iPod’s beauty.
Product page via UberGizmos