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The only thing that stops me from using it as a player is that I can't shrink it down to a slim bar and/or auto-hide the playlist like winamp can.
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I used Itunes as my music player and control it by
1) When in FireFox I used the "FoxyTunes" Extension which puts on the bottom status bar the basic audio controls and the name of the song currently playing.
2) I use the Google Desktop sidebar and added a thing called "gdtunes" which lets me control Itunes or Winamp.
These seem to work well enough for me. See pics below of what they look like.
