http://www-03.ibm.com/press/us/en/pressrelease/33373.wss
http://ken-jennings.com/blog/?p=2464
Not to mention explicitly giving the tip to GiveWell in both venues.
http://www-03.ibm.com/press/us/en/pressrelease/33373.wss
http://ken-jennings.com/blog/?p=2464