Bamboo Bikes
Bamboo Bike from Calffee Design
Various custom models and pricing arrangements
Bamboo make for a comfortable ride and helps to dampen vibrations. Lugs made from hemp or carbon fiber. Can be used in racing or everyday use. Hard to think of a more eco-friendly transportation mode. Here is a interesting article by a Bamboo bike owner at americanBamboo.org Also, here is a good article showing how someone makes his own bamboo bike frames.
