According to TVSquad.com,
...the video is part of a...marketing campaign by UK broadcasting network, Sky. The network and its ad agency created the dead-on, live-action video as part of an on-air promotion for The Simpsons. They even had the blessings of Simpsons producers and creator Matt Groening. The ad gurus thought it was so cool that they decided to launch it on the internet and just let word-of-mouth go to work for them. Obviously, they were successful. The video is huge right now...Youtube.com has it but the video quality isn't that good. Instead, go here to view the video in one of two different formats.