A database of sounds under Creative Commons license. There are search and random sound options, as well as user tags and geotags. You can mashup several tracks at once. Useful if you need sound effects or background for a web page.
The Freesound Project is a collaborative database of Creative Commons licensed sounds. Freesound focusses only on sound, not songs. This is what sets freesound apart from other splendid libraries like ccMixter. New to this site? Read the What is Freesound page to learn more!