hi,
as I was bored to try env_sound entities in my map, compile, then check that finally sounds weird, I decided to build a kind of map that gather all possible env_sound with HL/Hammer, to faster and simplier get what I need,
if you are like me, here is the awesome sound designer set :
http://www.ideaseed.net/maps/CS16/SD/
american isn't my first language, you are free to comment my writing skills and improve the map description.
sorry if the idea had already been posted, I just never heard about that, so ...