From BikeMike comes this video of the Tarus 2, an incredibly light (about 100 pounds) and capable small “adventure” bike. Thanks to the tiny 5 horsepower engine and fat 220mm width tires, it seems this bike can nearly go anywhere, albeit slowly. And if you get stuck, just pick the bike up and throw it over the obstacle! Watch till the end to see how it gets disassembled (which can apparently be done in less than 5 minutes).
Head on over to BangShift for more technical details, where they say that you can also buy plans for the bike for about $37 and build it yourself…