I been trying to figure out hitrecord.org, a site built to let artists collabroate. I need with the sound quality for the podcasts. However, while hitrecord.org is an awesome site, I think the people are there want a bigger contribution then just helping you fix the audio, they want to help you create or as they say collaborate on the content. Regardless, it is a fun site to play around in.
Everything there must be your content or public domain.