20Q.net – 20 questions AI Dec 14 2004
It took 29 questions to guess black cat. Pretty cool anyways, though. 🙂
20Q.net is an experiment in artificial intelligence. The program is very simple but its behavior is complex. Everything that it knows and all questions that it asks were entered by people playing this game. 20Q.net is a learning system; the more it is played, the smarter it gets.
(Via MetaFilter, some great comments in there…)