Everyone's favourite Italian Plumber has a proud history in the world of video games;  26 years worth of it in fact.  IGN has just released a comprehensive history of Mario and you can track his evolution and subsequent devolution if you take a look at his newest game which is great.  Anyhow I always have kids who try to put together presentations on video games and I would point them here for an example of how to do it right and in the mean time learn how Mario has changed the face of video games for over 2 decades.  Check it out here.