Researchers at Duke University have created microscopic robots able to dance on an object smaller than the head of a pin. "Each microrobot is shaped something like a spatula but with dimensions measuring just microns, or millionths of a meter. They are almost 100 times smaller than any previous robotic designs of their kind and weigh even less."
An upcoming paper on the robots will be published in the Journal of Microelectromechanical Systems.
Complete article:
http://news.duke.edu/2008/06/microrobots.html