I'm not trying to drown you in "soundy" type things, but this is a fantastic audio dictionary I ran across a few months back.
Sandy Lerner (one of the founders of Cisco Systems) spent more than two years putting it together, just out of her passionate interest in the world of sound.
If nothing else, her biography is definitely worth the read.
I JUST SAW THAT THE DOMAIN IS UP FOR RENEWAL!! I HOPE MS LERNER WILL RE-UP THIS ONE, AS IT'S A MEGA-HELPFUL SITE!!!