SF Klein
Senior Retro Guru
It uses a couple of rods that go from the handlebar to the seat and then down the frame and forward to the front wheel to accomplish steering. It looks like it's inspired by a car's steering system. Video of it in action here:
http://www.youtube.com/watch?v=7qiR7E3d ... _embedded#
http://www.youtube.com/watch?v=7qiR7E3d ... _embedded#