Involved Organizations

The Village Bicycle Project: http://www.ibike.org/vbp
The Palouse-Clearwater Environmental Institute: http://www.pcei.org
Bikes Not Bombs: http://www.bikesnotbombs.org

Other Bike-Related Organizations

The International Bicycle Fund: http://www.ibike.org
Broadway Bicycle School: http://www.broadwaybicycleschool.com
The Massachusetts Bicycle Coalition: http://tdc-www.harvard.edu/massbike

Bicycle Science and Mechanics

BNB's Earn-A-Bike Instructor Training Manual (free!): http://www.bikesnotbombs.org/eab-it-man.htm
        note: if you download/use this, please credit BNB and let them know you've put it to use.
How Stuff Works's article on How Bicycles Work
The Exploratorium's article on The Science of Cycling.