I thought this was really interesting, Bill Steele has developed a heads up display the projects onto the backside of your spinning prop.
Bill works for Microsoft is an avid pilot, owns a couple of airplanes and I know him from my "Real Life", he was working on a PFD that he had completely designed and developed himself. This was his next step, it is really interesting, makes you wonder where GA will be going in the next 10-20 years.
Anyway, here is a link to his website VirtualHUD, it would be nice to see one of the little guys catch a break.