clickwheel ipods have longer battery life as well as being considered the 4th generation ipod, where as the non click wheel ipod is considered the 3rd gen. 4th gen ipods can also be powered by usb 2.0 as well, 3rd gen cannot. i personally think the 3rd gen ipod is the best looking ipod to date because of its all white exterior, but that new nano is pretty damn nice.