Here's a line tracking robot I built with friends at university. I thought I would post it here before it sinks into oblivion. It was built using a 16bit micro-controller (ATmega16), a PCB, a small motor and some sensors. The programming was done in C/C++. Source code and hardware (if you can pick it up - Montreal) available upon request.
Any ideas of how I could turn it into something useful? I also got a proximity sensor if that can be of any use.