Check out the Hybrot (http://www.gatech.edu/news-room/release.php?id=125)
The Hybrot, a small robot that moves about using the brain signals of a rat, is the first robotic device whose movements are controlled by a network of cultured neuron cells.
The team uses networks of cultured rodent brain cells as the Hybrot's brain, and has essentially given the cultured neural networks a body in the form of a mobile robot.