While I haven't done any aerodynamics work on my motorcycle, there have been some people that have done great work on theirs.
One I thought looked fantastic is right here on Ecomodder:
214 mpg with DIY aerodynamic fairings on a Honda 125cc motorbike
Also, look up Craig Vetter. He has been working in motocycle aerodynamics longer than anyone.
Craig Vetter, designer and inventor of the Windjammer fairing,Triumph Hurricane Motorcycle and fuel economy motorcycles