OOglyDOOde writes: "This link points to a competition being hosted by a company that makes research on artificial intelligence. The task? Build a program that can play a number of games whose rules are totally unknown -- and earn the best score while competing against various opponents. Your program is told the possible choices available, when it should make a move, what did the opponent do; and what was your score for the last turn. There are no entry fees yet there is a cash prize. Submissions can be done in various languages, or in Linux or Windows binaries."
This is certainly one of the odder ones I've ever seen, but has interesting prizes (trip to Israel) and rules (fairly broad entry categories).