Magnetically Linking Robots
One cool idea among these is that the robots can join together in some movable arrangement to perform tasks - to cluster together. They could be very handy for all kinds of things, including rapid prototyping, bridge forming, creating robotic manipulators and other stuff. Avoid however creating something like the Stargate replicators.
Having real swarmbots on Nano Scale is still quite a distance away, however, a team at Carnegie Mellon University led by Seth Goldstein have come up with demonstration robots which use a ring of electromagnets around their perimeter to bind and move around each other. The goal is to create the microscopic swarming robots eventually, and use electrical charges instead of magnets.
These demonstrations of robots have been dubbed “claytronic”. NewScientist created a video of this demo in action.