Here's a mind-boggling (to me) site recommended by David Passell. He writes this "might be of interest to anyone that wants to read. write, publish, edit, or comment on free-source software manuals. See the site for Floss Manuals Foundation of the Netherlands here.
"Those who are interested in Video might like to peruse the Theora Cookbook. I haven't done it thoroughly yet; not that much time on my hands. I am registered with them (as you or anyone else with something to offer can. I got into it through wanting to find out more about my One Laptop Per Child (OLPC) XO computers. They do much of the documentation (a lot is incomplete) on it."
David closes with, "I might warn you that the site, links, and such seem rather complex. Once you get registered though it kind of falls into place."