This site has some free sound effects, sound clips and much more!
From the Authors:
SoundBible.com offers thousands of free sound effects, sound clips, and straight up sounds. These sounds can be used in a variety of sound projects including Video Sound Scores, Movie Scoring, Game Design, Powerpoint Presentations, Prank Calls, Sound Boards, and the list goes on. SoundBible.com is a great source for copyright free sounds.