I have a ipod nano, I use it quite alot. just go to :
http://store.apple.com
I want a bigger one to put more music on, so we will see if Santa brings me one.
Both my kids both have ipods and the car converter to plug it in. A lot of newer cars have audio jacks or docking stations.
We had to take an unexpected car trip last feb, and between all our ipods we didn't listen to the same song more then once and it was a 22 hour round trip.