G-Map Games is a very interesting initiative to develop games around Google Maps and Flash. The games are all based on simple engines that converts flash screen coordinates to latitude and longitude coordinates. The latitude and longitude can then be passed to Google Maps to move the image background. The games are extremely simple and there is already some working demos such the GBlast. Currently firefox is required, and broadband connection for a better game fluidity.
http://googling.phpmagazine.net/upload/2006/04/gblast-thumb.png