www.lala.com
Registered with the service. Used the music match software to register the 6000+ songs on my harddrive. Using Skyfire on my TP2, I can access my complete catalog of music via Lala and stream any song, playlist etc from the Lala server without my home PC being turned on. Even better there isn't an App for that on the iPhart.
Also allows connection with Facebook, Twitter etc for those of us that are socially connected that way.