Nimble autonomous flying copters: video

The GRASP Lab at University of Pennsylvania made this video that shows off the "precise aggressive maneuvers" of an autonomous quadrotor helicopter. It flies through small windows, perches on walls, and nimbly flips over. I imagine there are quite a few applications for something like this.

Maniobras alucinantes de cuadricópteros autónomos (Thanks, Antonio!)