Im gonna say the one i use most is itunes.
It keeps my music organized in folders the way i like it.
I like the way it handles playlists and searches for songs.
Although my vote will have to out to amarok ( linux only =[ )
But until i can run PS CS2 9 on wine really well i wont be switching.
Amarok is great I love the lyrics search which is better than any plugin for itunes.
Although WMP has a pretty good lyrics plugin and so does winamp.
Well until something automatically organizes my files like itunes does I wont be switching. Ok anyways sorry about my rants.
What do you think?
(PS im sorry if i left your player out)