In dem early days, I used Winamp exclusively. Now, I'm using
Songbird. Imagine what Firefox would be if it were a media player, and you have Songbird. It uses an interface layout actually very similar to that of iTunes, and also provides you with iPod synchronisation functionality. The main difference here is Songbird not being a huge piece of shit. Also, most of Firefox's add-ons are compatible to Songbird as well, and I find myself actually prefering Songbird's web browser, it's that awesome. Oh, wait. They're actually almost the same.
I'm also using iTunes, but that's mostly because Songbird can't keep up with the retarded way the iPhone needs to be synced. Yet.
But, to be honest with you guys, the one media player which completely captured my heart would be
Amarok. Too bad I'm spending more time on windows machines and I just can't handle the idea of defiling such awesome software through using a windows port.