Free-Loops.com provides many free sound clips, but we really specialize in free loops as the name suggest.
If sounds are more your thing then you need to hop over to SoundBible.com the "Holy Grail of Sounds"
Sound Bible specialized in free sound clips and royalty free sounds. No loops, no beats, no basslines, or instruments, just straight sounds.
The site seems to be a work in process however, so we'll have to wait and see, at the time this article was written they seem to have only a few hundred free sound clips. They seem to be adding sound almost daily so it seems they will have a good library of sounds soon enough.
The website url SoundBible.com be sure to bookmark the page and check back for their updates.
The site seems to be lacking articles so maybe they should add a few on some sound recording, or similar. All in all worth a try, and a great concept.