iPod nano 5G and 4G
by Volker Weber
Hard to see in a photo, but the shell is little bit thicker, making the iPod 5G more sturdy. Nasty: Apple moved the connectors around so your old dock does not fit. They ship with a piece of plastic for the universal dock, but that won't help you if you have more than one.
While the 4G and 5G appear to be similar, you can see the larger screen and nicer material here:
