This is a very useful collection
For example, Douglas has the best collection of data available--to the best of my knowledge--on the amazing Schilovski car.
More on the Schilovski car via the Wolesley UK connection.
Info about a gyroscopically stabilized car in the sixities by inventor Louis Swinney.
More info about same vehicle, actually written by the inventor.
The "large wheel" approach to a gyro car, nicely illustrated.
Wikipedia entry for the Ford Gyron.