Mophie has been making battery packs for Apple products like the iPhone and iPod devices for a long time now. The company has a cool battery pack case for the iPhone 3G/3GS called the juice pack air.
Mophie has now added a new juice pack air to its line for iPod touch users as well that is available now for $79.99. The touch version looks just like the iPhone version and wraps around the iPod to protect it from drops and scratches.
The internal battery can be charged via USB as the battery for the iPod is charged at the same time. Mophie claims that the device is good for up to 36 hours of audio playback and up to 6 hours of video.