Free Sound Effects and Music
I have mentioned this in a comment on another post but figured I'd put it up here in case anyone doesn't know how to unlock this amazing part of the Adobe suite.
Adobe Audition (and Adobe programs in general) is packaged with heaps (thousands) of royalty free sounds. You simply need to download them and unzip them and you can import them into Audition, Premiere, Flash, etc.
There are heaps and heaps of really well recorded and specific sound effects that you will never be lost for sound. My personal favourite is "Human Chew Banana".
This is the link.
If that link doesn't work here is the URL that you can copy into your browser: http://offers.adobe.com/en/na/audition/offers/audition_dlc.html