Am not to sure about this website but it should fufill your needs at least
http://www.grsites.com/sounds/
I had a media practicle I need sound affects for, but I lost this awesome site that had everything but sadly I can't find it anymore, It had something to do with rabbits in the URL I think...
http://audacity.sourceforge.net/ - thats good to record noises yourself aswell.
Sorry didn't see the direct Download link so here's an edit^_^