I did something similar, and talked about that in Belfast on YAPC::EU-2004. Maybe you can pick up some ideas to extend your script. Listening to music you like during work certainly improves both work and motivation :)

My "radio" followed the playlist on the website of the station that was playing, and noted all song-switches. It then used a database with my song-ratings and modified the volume. If I had rated a song a 10, the volume went up, if I rated it 2 the volume was turned down. If a song started that I rated 1 or less, it switched stations.

The interface also allowed ratings for new songs (it displayed the rating if available) and then stored the rating in the database. I still have that database:

$ ratings.pl
Low ratings:
|  1   64 groups,  492 songs
|  2   90 groups,  319 songs
|  3   76 groups,   95 songs
|  4   55 groups,   62 songs
|     202 groups,  968 songs

Medium ratings:
|  5   42 groups,   42 songs
|  6   52 groups,   56 songs
|      92 groups,   98 songs

High ratings:
|  7  152 groups,  196 songs
|  8  240 groups,  403 songs
|  9  137 groups,  431 songs
| 10   40 groups,  150 songs
|     415 groups, 1180 songs

Total:
|     710 groups, 2246 songs

Avarage rate: 5.4
[download]

I meanwhile skipped to two stations that fit my taste better and seldom need switching. (I still have to switch when either one is off-line). Both these stations now send title and performer in the stream, so I don't have to follow websites anymore. GStreamer gives me that info while playing. As xmms is dead, I also no longer use that, but a handcrafted radio.pl written in perl/Tk.