Portable MP3 players?

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?

Thanks!
--
Take care,
Jenny

Random quote of the day:
Barker's Proof:
    Proofreading is more effective after publication.