Predict How Long You’ll Live (Northwest Mutual)
Predict Your Child’s Due Date (Ayres)
Predict Your Child’s Adult Height (University of
Predict Justice Kennedy’s Vote (Ayres)
Predict Your Next Move in Rock-Paper-Scissors (Chappie)
There are many other prediction tools here (do click), from Ian Ayres. Ayres requests that you email him other prediction applets, which he will add to the page. Ayres also has a new book out, Super Crunchers: Why Thinking by Numbers is the New Way to be Smart; it is highly readable and also endorsed by Steve Levitt.
I thank Ian Ayres for the pointer.