Spotify is a music streaming service that has been around in the UK for a while now but it just launched in the US. right now you have to be invited to Spotify to get a free membership. Currently Spotify has an invite only free streaming service and you can get your invite at this link:
I am leery of putting my email into anything on the web but I did not this because I really would love to check it out and see if it is better then the rest of the competion out there. I got my invite in less than 1 hour so I hope it works for you as well. I will post more once I have figured it out and tested it.