http://www.zdnet.com/i/story/61/18/017591/zdnet-ipod-nano-si...
Giant clip dominates the back, just large enough of a screen to choose or control music, and just enough space to store way more than I need.
I travel a lot, it's great to have a separate music device. I can listen to music and not have to worry where my phone is. I can clip it onto my clothes while I'm falling asleep in a hostel or whatever. Actually I clip it to my clothes all the time.
I don't understand why it wasn't more popular. I still use it.
I also don't understand why anyone wants to use their phone as a music player. The idea of that sounds needlessly awkward and they'll fill their device's HD up with largely useless music.