Bloodhound

 Link to a pic:  www.dropbox.com/s/w2q1y9kmb5ia7vs/IMG_4918.JPG

Bloodhound has 3-light sensors, PID, all-wheel-drive, and a LEGO MindStorms RCX to control it.  It can follow the line at a speed in excess of 80cm/s.

Bwa ha ha ha ha ha ha.