I have sponsered two children via the Canadian Foster Parents Plan. They have all their financial statements on-line proving that 9% goes to staff, 11% goes to fundraising (those TV commercials) and 80% goes to programs.
I chose FPP because it completely secular. Some of the more radical groups with religious ties refuse help to those who refuse to convert. But even the moderate groups will include in their programs "purchasing of bibles for school children". I want no part of their crusade.
But I've been more than pleased with FPP because of all the information and services they provide. What I mean by that is that I get regular updates as to where my money is going, what progress is being made, how my particular foster child is doing (though, really, that is secondary since a large portion of the money goes to community projects such as helping dig new wells, building new schools, funding teacher training, etc). You can make of it what you will.... how much you get out of it depends on how much you put in. They have a translation service, so you can e-mail your letter to their service and they will translate and forward it onto your foster child. They again would reply via the translation service, so you can keep up-to-date on a more personal level. I'm much too busy to keep in touch with my foster child, but I have sent gifts over. I'm an absentee foster parent.

But some people actually co-ordinate visits to their adopted village to see the changes. So it's up to you how involved or uninvolved you get.
My only negative is that once you start giving, you start getting phone calls asking for more. But that's the same with every charitable organization. They go after their own membership more than trying to add new people. I also fund Amnesty International and the David Suzuki Foundation and it was the same thing. Just ask to be put on their do-not-call list and that takes care of that.
BTW - their link is here if you want to read more:
http://www.fosterparentsplan.ca/