Polling the Crowd Within: "the average of two guesses for any individual participant was better than either guess alone, regardless of the time between guesses. So polling the ???crowd within??? does indeed yield a statistically more accurate answer. What???s more, this internal crowd gets more independent-minded with time: Contestants who were asked to second-guess themselves three weeks later benefited even more by averaging their two guesses than did those who second-guessed themselves immediately.???"
This gives me a great idea for a killer cellphone/IM (or Twitter?) application, should anyone have any spare seed money kicking around...