Did you actually try Grokipedia? (Public Board)
I tried it the other day. Didn't have an article for the question I asked. It said do I want one generated. I thought, that's pretty cool, and efficient. Yes please. It said jason 500 error you're not subscribed no soup for you! (in many more words than that).
Disappointing :)
Hopefully one day it will be useful. It will be as bad as wikipedia in a different direction but at least it's a different perspective and will cover some things that some other sources won't.