Just wanted to pass on that I found a site where you can make your own flash games for free. It is called http://www.contentgenerator.net/ I usually do the game Fling the Teacher which is sort of like Who Wants to Be a Millionaire because it has the questions and the life lines. We do it whole group or in teams. The kids get a kick out of how they get to catapult this villian looking teacher at the end. (I know, but they love it and they are learning) You can download it at the above site and you can see an example of a finished game at http://www.newton.k12.ks.us/tech/fling3.html I'd let you see my games but I have figured out how to do that yet
Also check out http://classtools.net and www.superteachertools.com for some great flash games/tools for your classroom!