My name is Keith Watson, I'm the information security manager for the Georgia Institute of Technology College of Computing.
NarkNet uses free off-the-shelf technology to passively intercept wireless networking traffic. NarkNet is the best method I have found of proving to people that they are not safe online and that by changing the security settings of the services and social networking sites they use, they can protect themselves.
Check the calendar of appearances if you would like to see a NarkNet demonstration or you can contact me to arrange a demonstration at your conference or event.