I saw something about an upgrade to Google Talk. I dl when it came out but have never used it. So I upgraded to check it out and they have something where you can have the music you're listening to show up next to your name:

http://www.google.com/support/talk/b...y?answer=43427

So they gather that information and it goes here:

http://www.google.com/help/features.html#music

Not sure if those are Google affiliate ids or not or just ids for the music.