Bicycles and Bike Parts
Most organizations that collect bikes are either (a) youth programs, often for at-risk kids or (b) export bikes to the developing world, where they are a crucial for transportation of people and goods. What types and conditions of bikes are accepted varies widely, but since they’ll almost certainly have to put some work into getting whatever you give them up and running, seriously consider giving them at least ten or twenty bucks to smooth the way.
If you don’t have a bike but love the idea of providing someone with one, consider (a) giving money to any of the places listed below or (b) donating to Wheels4Life, which buys bikes in the targeted country to give away. This is way more efficient than packing up our used ones and shipping them off thousands of miles away, and supports the local economy to boot.
Nationwide: General Directory of Youth Bike Programs
California, Mountain View: Bicycle Exchange
California, San Francisco: Pedal Revolution
Chicago, Illinois: Working Bikes Cooperative
Minnesota, Minneapolis: Re-Cycle
New Jersey, High Bridge: Pedals for Progress
Oregon, Portland: Community Cycling Center
Washington, DC: Bikes for the World
Also, I have to list these guys, because of the novelty factor:
Marquette, Michigan: Bike Furniture Design They make furniture out of bicycle parts, and accept some recycled bike parts!