deadbeef is a very nice lesser-known linux music player that's heavily influenced by foobar2000. quodlibet is probably my second favourite, but it's written in python, so it can be a bit slow/heavy on resources at times. banshee is great for large libraries and as an iTunes replacement.
I switched to quodlibet for the fast indexing and searching of large libraries. I'm sure other media library managers do that too, but it seems to be very nice in quod.
If you're a linux user then 'audacious' is a good/similar replacement to winamp IMHO.
I switched to using quodlibet some time ago. Can't remember why (simplicity, the right views, stuff) but now everything else seems sucky.