My wife had a chance to see and chat with Jimmy Wales a bit today. He was giving a talk at the MacArthur Foundation. We know him from when he lived in Chicago and worked as a trader, way before Wikipedia.
I don't really keep in touch with him anymore, but he was always alert to opportunity, and always very reasonable, and I imagine these are 2 of the qualities that helped him shepherd Wikipedia into the most stupendous encyclopedia ever written.
(As an aside, I don't want to put Larry Sanger down in any way - he's also a brilliant guy. But I didn't know him nearly as well.)
It's a knowlege compendium
with no endium
And the price is so right.