www.appanext.com Pictures, comparison of 4G. 4G 40 GB vs 3G 15 GB. 4G iPod has some cool features together with the obvious ones. Such as,.... 4G iPod automatically pauses when the headphones are unplugged. It is very easy to customize the menus right from the iPod. New playlists can be created and deleted right from the iPod, without a need for a computer. etc, etc.