... contrast that REX thing. A credit-card sized PIM which is basically only good for displaying information. The idea is that it syncs, regularly, with your PC, so that it's the latter device that you enter the information into. The REX is simply used for referencing this info.
Personally, I stuck with a Palm, so that I could enter info into that if I wanted, but horses for courses.
Upshot is, the iPod may well be a "kinda" PIM. Just don't get hung up on this "all things to all people" idea. Everyone has different ideas as to what they want from their technology. The iPod may well have PIM "abilities", but it's not going to be the PIM of choice for a whole lot of people, purely by dint of the lack of usable input device.
Well there you go.