Don Duvall is a local election candidate who wanted to use YouTube to get his message out. He was videotaped in his office in front of a green screen, and then composited with background stills and video to support his message.
The green screen was a Lastolite popup with just one additional light. Shot in HDV, down-converted to YouTube friendly 4x3 SD in camera, the footage was keyed using Adobe Ultra CS3 (formerly Serious Magic). That software is indeed, Serious Magic. Keyed in 5 mouse clicks.