Napster.fm launched (to little fanfare) recently. Yet, given that it is an Open Source / Social Music Player that can be hosted virtually anywhere (by anyone) it’ll be interesting to see if said service gets slammed akin to what the forefather of P2P was hammered for: circumventing DRM (especially in OECD nations).
(Source) Napster.fm: http://goo.gl/cR0Di