Hey, if you believe what the RIAA is doing is wrong, then hurry up and sign the EFF's petition
if you haven't yet.
Writing audio code for spacegame. It's played music almost since the beginning, but no sound effects. SDL_mixer already has "good enough" positional audio for a 2D game. It has hooks for effects procedures, so adding doppler should be easy enough. I have to do my own channel management, but it does the mixing. I can only work on the "game" part so much before I want to go back to writing code :P