For my podcast I did something similar using Github to be a wiki for user contributed shownotes. If users want to contribute to the shownotes, they just send me a pull request. When I merge, it shows up on the site.

https://gist.github.com/Apreche/3622666

https://github.com/Apreche/FRC-Shownotes

example:

http://frontrowcrew.com/geeknights/20100701/non-legos/