Having never owned an Ipod before, I decided to splash out on the new ipod nano about a month ago. It's great -- it does everything I want it to and more.
For those who have mentioned it crashing - mine has only crashed once and it was when I accidentally disconnected it when it was synching - if you hold the menu and the circle middle button down for about 10 seconds it just resets itself and turns on again so you don't have to wait for the battery to die. [It doesn't lose any info or change anything when you reset it]
It is very lightweight and smart looking.
The downside is that the stainless steel back gets finger prints all over it and scratches very easily so if you do buy one you will most definitely need a cover of some sort to protect it.