Just saw a virtual Ipod - basically a website that lets you search for and play tracks, and create playlists, and with a mock Ipod interface. Better than last.fm in the sense that you play exactly which track you want. It has been described as the Web2.0 version of Napster. Hmm..
However it's legality is still in doubt, and it remains to be seen if it will be pulled off the net. Partly why I'm not posting a link. *shrug*