Cory Doctorow mentioned using Freesound Project to find sound for his Little Brother podcast. Wow! Think Flickr for sound. AIFF and WAV files listed and geo-tagged! For a sound buff like me this is heaven with a URL! Check out this map, it shows exactly where the sound was recorded and lets you download the file. MTG has recently won a $50,000 Google Research Award so Freesound Project will likely, at some point, be acquired by you know who. 
Click to enlarge.
{ 2 comments… read them below or add one }
another great web resource similar to freesound is http://www.soundsnap.com
on the site thousands of user submitted samples, loops and sound effects can be found and shared
Thanks, John!