Where can I find free sounds for my game?
This is the one I hit up the most: The Free Sound Project
Freesound is a great resource. Most of it still needs some editing, but they make a great start.
Freesound is absolutely great. Thanks a bunch for posting it, I already just found some of the most important effects for my game in about five minutes. I might need to chop them up, but that's totally fine!
I know this thread is rather old but the guys at Sonniss released two decently sized (10GB+ each) audio sample packs at GDC 2015, they've included some very interesting and creative samples all in rather high quality formats with permissive royalty free commercial licenses. You can down load them from http://www.sonniss.com/sound-effects/free-download-game-audio/ and if you email Tim directly he graciously will send you the previous packs they've released freely to the community.
Same thing I posted ( http://gamedev.stackexchange.com/questions/8/where-can-i-find-free-sounds-for-my-game/10#10 ), but thanks for mentioning the Flash version