lslibn 's List: Audio Resources

Welcome to Wikimedia Commons,va database of 10,252,250 freely usable media files to which anyone can contribute.

Stream and download for free. Selection as of 5/2011 included over 300,000 free music tracks.

The Freesound Project aims to create a huge collaborative database of audio snippets, samples, recordings, bleeps, ... released under the Creative Commons Sampling Plus License. The Freesound Project provides new and interesting ways of accessing these samples, allowing users to
    * browse the sounds in new ways using keywords, a "sounds-like" type of browsing and more    * up and download sounds to and from the database, under the same creative commons license    * interact with fellow sound-artists!

Simply email Posterous with an audio file attached (like .mp3, .wav, or .m4a). The subject of the email is the title of the episode. The body of the email is the description of the episode.
After the email is processed, it is added as a new post to the site. The post will contain a player for the audio you attached.