[Lucifer]

Great backup battery / battery extender device for Zune 30GB model. I have one, I got it at Sellout.woot.com for about $30, great deal! but anyway review:
both a case for the zune and a battery extender +
Doubles battery life for video / music playback: normal music 12 hours, with tunepower 24 hours. normal video 4 hours, with tunepower 8 hours. +
it has a kickstand type device to hold up the zune horizontally in wide mode for video and photo playback +
has no screen protector -
it wouldn't take much to add a simple clear plastic screen protector if they just thought about it once.

Overall its a good device, even if you have to manually connect the battery to the zune every time you put the zune into the case.. but I appreciate the doubled battery life.