Here are some resources for audio:
http://www.freesound.org/browse/ (thanks Chris!)
NOTE: if you’re going to add sound, a .wav or .aiff format is preferable. Compressed video such as an .mp3 file doesn’t get the best results and may hang you up.
JCCC has a subscription to Killer Tracks, which is royalty-free music that you can add to your project. It’s a bit fancier than some of the free stuff you get online, so definitely worth checking out:
http://library.jccc.edu/dataref/db-subj.html#muse
NOTE: it takes a while to get your email verified and access, so plan ahead if you need this.
Vimeo has a new Vimeo Music Store which might be useful. Many of the downloads are royalty free and free under Creative Commons licenses. If you aren’t familiar with that check out creativecommons.org
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