"The point is that you don’t need a whole lot of people to participate in order to create something pretty impressive. That’s how Wikipedia became the behemoth it is today."
Interesting. Wikipedia shows about 50k active editors (5+ edits) for any given month in 2006 -- I didn't keep the URL, but that's pretty much right. I didn't realize how much output the "9%" yielded.
I'm not sure that's true. http://www.aaronsw.com/weblog/whowriteswikipedia