Spend most of the day (and some of yesterday) hacking on an Audio CD view for Rhythmbox. It seems to be coming along pretty well; it reads the disc data with musicbrainz (in a thread of course) and updates the nodes nicely. It also stores your ratings for the CD tracks, and it should be possible to share the rating files (stores as XML) with your friends if you like to do that.
Though, after upgrading my gstreamer to 0.4.2 it doesn't switch tracks anymore. This seems to be an issue in Gstreamer which I hope will be solves soon.
The code is not in CVS yet, since we want to do a release of RB first.
If you want to see a shot here is one. Enjoy it.
Tomorrow I won't have time to hack on it though; tons of homework to be done, and tons of graphics functions to be implimented for my upcoming project.