When I ask someone how they know if a charity's any good, they often bring up Charity Navigator. It's not the only site out there evaluating charities, but it's the only one people seem to have heard of. From the perspective of improving the process where people figure out where to give to, trying to help people do as much good as possible, it's potentially an excellent resource. Unfortunately, it doesn't rate charities on the thing that actually matters: what does your money do?