Thanks for mentioning Wilmington's Urban Bike project. This is a great use of older bikes. It also means that people can get vocational training, and kids can get "pre-vocational" training. I know Chicago has a similar project. Here in Boston the place to go is
http://www.bikesnotbombs.org/about
I'm volunteering there, eventually as a adult instructer in their "Earn-a-bike" program. If a donated bike isn't used in EAB, it may be shipped to affiliate programs in Africa or Central America, or if it is really unsafe it is stripped and recycled. Every urban area needs a program like this.