I've recently completed a project which uses processing.  It's a 3D Visualisation of player death (by impact) from the video game, Just Cause 2 by Square Enix.

The Visualisation shows 11.3 million player deaths that were caused by impact (mostly impact into the world's geometry)  

I have the pleasure of working for Square Enix, which is how I have access to this data, I help manage the metrics systems that capture player data which we use for research and learning. All the data we collect is anonymous.  I've made extensive use of both the GLgraphics and ProScene libraries in this project, and learned a lot about processing and programming in general.  If anyone is interested, there is more info on this project on my blog jimblackhurst.com . The project was also recently covered on IGN.com and you can read the (brief) story here .  

Thanks to processing and it's most *Awesome* community!

Jim