Mind power

Wikipedia is an amazing exercise in distributed intelligence.
Points:

• People have written bots to try to automatically detect vandalism
• There's chat rooms where people watch edits and try to see vandalism
• Vandalism is often cleaned up within 5 minutes
• Articles that have 'stub' status (need more detail) get recategorized into more specific groups
• Articles get cleaned up when someone adds something that isn't wikified (an internal link) or if they have extra newlines.

Wikipedia is just a great example of lots of minds helping out a little, and a few helping out a lot, and getting something done. It, to me, is one of the most amazing clusters on earth - all human, all unpaid.