Looking for free sounds for a project of yours... say, atmospheric background noises, or a dog barking, or laughter, piano music, a squeaking door, or anything else? FreeSounds.org is a great collection of Creative Commons licensed WAVs, MP3, AIFF files and more. You can enter a whole lot of things into their search engine and get back a whole lot of great samples. You can hear a preview for every sound, and for downloading a quick registration will do.