In a previous post, you may have seen Marc's version of a line-following robot using a chipKIT Uno32 and an Arduino Motor Shield (among other things), but if you haven't had enough of robots or you're new to robotics, check out this other line-following robot by Jay from Digilent using a chipKIT DP32! This example is particularly nice because it's perfect for robotics beginners as it is quite inexpensive to build. The robot chassis is actually made of cardboard (so it doesn't get much cheaper than that), no motor shield is required either, and instead of buying line sensors, you can make your own.
Enjoy!