This is shameless plug for my step uncle's book, Out of Poverty: What Works When Traditional Approaches Fail.
My step uncle, Paul Polak, has got to be one of the greatest people I have ever had the pleasure of meeting. He is passionate, intelligent, and 100 percent dedicated to his cause. In the time the I have known him, he has be listed in Scientific American as one of eight visionaries who can positively impact the future of our planet over the next 50 years, ended poverty for 17 million dollar-a-day farmers, and started a new organization called "Design for the Other 90 Percent", which is partially funded by the Bill and Melinda Gates Foundation.
Go check out his book and his work. :)