Portable MP3 players?

Philips Expandium 301. If I were to upgrade I would either go to the 503 or go
with one of the hard drive type MP3 players (e.g. Nomad, Arcos Jukebox, etc...).

> I'm considering several models, and would like to know what y'all are using.
> I'll tally the results and post a summary if I get a decent sample ( >10).
>
> Which model do you have?
> Do you use it with Windows, Linux, or Mac X?
> Likes / dislikes?
> If you're thinking about upgrading, what model(s) are you thinking about?