http://listen.grooveshark.com
Quite an interface, much better than Pandora.Grooveshark is an internationally available online music search engine, music streaming service and music recommendation web software application, allowing users to search for, stream, and upload music free of charge that can be played immediately or added to a playlist. Grooveshark aims to help bridge the growing gaps between artists, consumers and those in between who distribute, market, and promote music.