I was thinking it would be cool to have some sort of in-game music. This could really help create the adrenaline pumping horror movie mood that the name "Tremulous" suggests.
I'm thinking that maybe the game could even change tracks based on what's going on in the game; like if you're dogfighting a Tyrant with a bsuit and chaingun there should be fast-paced music, and if you're a lone human out alone during S1 there should be ominous sounding music.
This probably isn't practical for a number of reasons, especially since Tremulous is distributed by downloading, and adding music would increase the size of the game significantly... but what do you all at least think of the idea?