Some very well engineered micro planes(translated) have been buzzing around the net. The goal here is ultra light weight. These suped-up paper planes have a remarkable target weight of around 10 grams (translated). The lighter the micro plane is the slower and more maneuverable it will be leading to some pretty interesting and scary applications. For controls it looks like many of the planes are using infrared receivers/transmitters (much like you would find in a TV remote hint hint). Getting the lightest plane possible has forced the designers to come up with some pretty ingenious tricks. For example, instead of using packaged servos they use a coil of wire wrapped around a rare earth magnet to control the flaps. You can see these home made “servos” in action after the break.
Some have taken a more classic approach and used rubber band power instead of a li-po/motor combo.