If you're interested in listening to a bit of discussion about game design (and a lot of discussion about other random things), check out Design and Conquer on OGR.
THU 5:00pm - 7:00pm PT
Something I made a note of was the conversation they had about music in games. Sheyla suggested a game where you can plug your iPod/mp3 player in to override the game's music, and have an ingame tool for switching songs and such.
I thought about a further development of that, where you choose a playlist of your own songs for zones/battle whatever.