I'm usually not thrilled by competitions, but I must admit this one has taken me. I refer to the Google AI Challenge promoted by the University of Waterloo Computer Science Club. This is a simple bot competition where you play in a one-to-one tron game with another bot from the competition in one of a set of maps.
The deadline for bot submission is 26th february, but don't wait untill there. The example bots are nothing close to the competition bots... You can follow my status here.