Recognizing Actions by Example Andy Wilson and Stephen Intille modified a robot player for the tank game Bolo to be a learning ally to a human player. The robot tank follows a human-controlled tank around, and with the aid of hints from the human learns to help the human out. Tron A genetic programming system, competing online against humans, is learning to play a simple video game. You can play against it. He provides C source code for unix machines.
Some teams use machine learning techniques.
Unfortunately, there doesn't seem to be a ranking or even a list of contestants. See also the old version . An open programming competition involving a virtual car race. Some of the contestants are tuned by learning algorithms. See the student projects RARS Driver by Averill, Bucken, and Nelson, and Reinforcement Learning and RARS by de Ridder and Tax.