We briefly chatted with Chris Miller, a software engineer with AKQA (the company that put the dirigibles together for Google), about the technology used in each aircraft. It all begins with an off-the-shelf model airship that's flown manually via standard a 2.4GHz radio. Each blimp is outfitted with a servo-controlled USB camera and 5GHz USB WiFi dongle which are both connected to a Raspberry Pi board running Debian, VLC, and Python. A custom-designed Li-polymer battery system powers the on-board electronics. The webcam encodes video as motion-JPEG (720p, 30fps) and VLC generates a YouTube-compatible RTSP stream that's broadcast over WiFi. Python's used to pan the servo-controlled camera via the Raspberry Pi's PWM output. The result is pretty awesome. 

Any chance you know what model blimp that is? I want one!