http://www.marcprensky.com/default.asp
Came across this site because this fellow is going to be one of the keynotes at the online elearning conference mentioned below being hosted out of U of C. There is a mass of resources here on game-based simulations. This is kind of a pet interest because of a project to develop an online environmental assessment simulation game I was involved with years ago. If only I had know about this guy and this mass of materials back then – SWL