Does anyone know some good and large free sound archives? Please share your links, we will need many good sounds I am sure. There are many crappy and small sound archives out there which offer synthesizer sounds like "boioioing", "uit! uit! uit!", "tötörööö" (the Clonk flag base sound amongst some others came from one of these archives, actually) so it's a harassment to search for specific sound on Google. Thats why its good to have a collection of reliable sources.

I'll start:
http://www.freesound.org/ - you have to register but otherwise it's a big archive with high quality sound effects, ambient sounds and even soundtracks!