This game was developed at my school and managed to get mentioned on slashdot. Here's the link to the game site: http://gar.eecs.ucf.edu/ Try the game out. It does have multiplayer features. It is a very fun game and I suggest you guys try it out . slashdot article: http://games.slashdot.org/story/09/07/08/1419242/Experimental-Video-Game-Evolves-Its-Own-Content
Interesting idea to combine neural networks and evolutionary algorithms with weapon design, though the comments in the video about nothing being designed by programmers are a little bit misleading. You have to have some form of seed/base designed and implemented in the first place in order to evolve from it.
Very impressive from what I read from the website, I'll download it soon and give it a try, I'd love to see that neural network in action, I've heard some stuff about it when I studied C# back in 2005 but never got into making one, as it seemed to be a heck of a job.