Researchers are working on insect-sized winged vehicles which can spy on enemy operations and even deliver a lethal injection to an individual.
Bill Christensen @ Technovelgy reports on some promising developments.
From an 19NOV2006 Technovelgy post: "According to Israeli daily Yedioth Ahronoth, Israel is developing a nanotechnology-based "bionic hornet" no bigger than an insect. This weaponized bug would be able to chase, photograph and kill targets, easily maneuvering in urban landscapes."
Once again, Science Fiction has served as the brainstorming tool to stimulate research. A 1936 Science Fiction story, The Scarab, foresaw such a device.