Called ARGUS-IS (both named after the mythological eye guy and an acronym for Autonomous Real-time Ground Ubiquitous Surveillance - Imaging System) this guy straps a 1.8 gigapixel camera to the bottom of an A-160T Hummingbird robot helicopter.
ENGADGET: Darpa develops a 1.8 gigapixel digicam and no, you can't 'check it out'