If you don’t yet know that Charitable Giving is now as customary (and easy!) as registering for china — and that you can be giving without sacrificing your bridely entitlement to receiving — this site will help you get with the program:
I Do Foundation will tell you where to register so you can give and receive at the same time.
Also check out Just Give which "connects people with causes they care about" in about half a second.
Being a PC bride has never been so simple. No excuses now to Do The Right Thing.