We've signed up with the I Do Foundation, which partners with various online retailers to donate partial profits of registry purchases to charity. In our case, the charity is the chorus, since that's where we met. These donations do not add to your cost - but must be done through the links below to be valid:
Target.com
5% of purchase price donated
Amazon.com
4% of purchase price donated
Instead of Stuff, you might consider a direct contribution to the chorus.