Yahoo! has announced an unlimited music subscription service that competes with Napster To Go.  At only $4.99 per month for an annual subscription, this is an amazing deal.  Not only can you access over a million songs, but you can permanently download songs for $.79 each and you get access to over 120 commercial-free radio stations.  Just like Napster To Go, you can download songs to any portable player that supports WMA 10 (Plays-for-Sure).  The service is also integrated with Yahoo! Messenger so you can share music with your friends, although I didn't see any details on whether or not your friends also have to be subscribers.  The subscription service is in Beta and currently only available U.S.-based subscribers.