Hi,
I was looking at a website created by Jonathan X Weinert, a grad student from UC Davis who is currently studying ways to make "transportation more environmentally sustainable in developing countries". He has work on fuel cells, hydrogen, and his current focus; e-bikes. Well worth looking at. Just follow the link:
There is also a movie he posted on youtube, picturing a mass of e-bikes swarming through one of China's larger cities. Have a look at:
http://www.youtube.com/watch?v=A6wQcIGx5Ew
http://www.youtube.com/watch?v=A6wQcIGx5Ew
Oren.