http://www.nerogame.org/
Just found this game on another message board
Neuro-Evolving Robotic Operatives, or NERO for short, is a unique computer game that lets you play with adapting intelligent agents hands-on. Evolve your own robot army by tuning their artificial brains for challenging tasks, then pit them against your friends' teams in online competitions!
NERO is an active research project run almost entirely by students. It uses the real-time NeuroEvolution of Augmenting Topologies (rtNEAT) algorithm created by Ken Stanley during his PhD work at UT Austin. The NERO project is a collaboration of the Department of Computer Sciences and the Digital Media Collaboratory at the University of Texas at Austin.
I'm not sure if you already know about this or if it's relevant at all, but I was wondering if it would be possible or pratical to do something like this with spring.