I found a nice series of articles about the Icarus system developed at the University of Florida (who invented Gatorade). Icarus is made up of mostly Perl scripts with the backend database running MySQL.

THERE'S NO DEBATE ABOUT ICARUS' EFFECTIVENESS. Before it was turned on, there were as many as 3,500 simultaneous violators at any given time on the Gainesville campus, school officials say. On the day the switch was flipped, 1,500 violators were caught. There were only 19 second-time violators and no third-time violators. Purged of the digital cholesterol of media files, the network saw an 85 percent drop in uplink data volume.

-Chris