WMP 11 is actually quite nice, but I reccomend you try MusikCube, great prgram, nice library and very low mem usgae.
iTunes, AllPlayer, QuickTime, MediaMonkey, RealPlayer, Sonique 1.96, Winamp 5.31, etc... For good Media Players look here : http://www.download.com/Media-Players/3150...-0.html?tag=dir
I use iTunes. I find that it's the best program for handling large music collections and large numbers of podcasts. I use Winamp from time to time, and I can't really fault it either.
VLC Player is AMAZING... it has like every codec imaginable... it even plays those stupid ass .avi's that everything else refuses to play.
I love winamp because of global hot keys -meaning during games I can pause, change songs, etc with out tabbing out of the game