Recently ran across Songbird - an Open-Source web-media browser. Seems to be a good alternative to winamp for online music.

Ever wish for a radio station would play only your favorite music and let you skip over songs you don’t like?
The folks of The Music Genome Project have created a radio station called “Pandora” that does just that for it’s listeners.
Tell Pandora what songs and artists you like, and you’ll hear other songs that […]