I was introduced to a very cool music site tonight at www.pandora.com.  Very simply, you enter an artist or song you like, and it creates a virtual streaming music station of similar artists/songs.  So far so good.  I began with a downtempo/trip-hop artist I like called  Peace Orchestra.  In the first 4 songs it served me up other artists that I already liked (Lamb and Jazzanova) and introduced me to a couple of new ones.  Go check it out!