This is a cool project that I stumbled upon at freshmeat today:
Darwin’s Tic Tac Toe uses simple evolutionary techniques to evolve a set of randomly-connected Neural Networks, with random weights, to play Tic Tac Toe (Norts and Crosses). To speed up the process, it has been written in a client-server architecture. Clients can connect to the server and grab a small batch of neural networks, do some processing, and send the results back to the server.