The Science Channel has a way cool video on their site of a 1/3 scale experimental quad-rotor hover bike. The air vehicle is designed by Malloy Aeronautics and is claimed to be more maneuverable than a helicopter. The video is amazing.
As a person with a disability who has always used wheelchairs and scooters, I have to wonder if a small version could have the right combination of size and thrust to take the place of larger mobility devices. Flying up some stairs would rock.