Here is a line follower with a great case. It also has a pleasant comforting sound.
The Wii Nunchuck looks pretty effective as a robot controller.
The robot's name is Lemons and it uses photocells to detect changes in light. It uses this information as a clever way of detecting obstacles by detecting their shadows. More information about this project can be found here.
I can't help but wonder what will happen when the self balancing robots get tired of being poked.
The controller does a good job at keeping the robot balanced on the smooth floor. Though it makes me wonder how the Segway deals with wheel slip. If you drive a Segway through mud do you crash or is there some wheel slip detection?
The cinematography in this video is great. More info about this project can be found here.