Thought you might enjoy a first look at our prototype Frisbee shooter:
http://www.youtube.com/watch?v=uXasF5PYAcs
It's a relatively simple setup that evolved over the course of time (and in the video); a motor, Lexan, and a pneumatic motor. I was really surprised how far such an intuitive arrangement could fire a Frisbee and even more surprised at how consistent it could shoot.