Dogsled is the Hummer of human powered vehicles

Built by a father and son for cruising around at this year's Burning Man festival, this giant people powered quadbike called The Dogsled, makes most other similar vehicles we've seen look kind of wimpy. While it would be tough to argue that this works better on a practical level than four regular bicycles, it certainly grabs your attention and looks like lots of fun to ride.
My favorite touch is the old school 1970s style green ecology flag.

Dogsled build site, via Dvice.com