Bringing solar light bulbs to the world
http://www.cnn.com/2011/TECH/innovation/08/14/solar.light.bulbs/index.html?hpt=hp_bn7
The gist of the article is having huge faceless (and often brainless) organizations ramming unwanted solutions down the throat of poor/disadvantaged is the opposite of the way to get widespread adoption. Find a way to enable these people to help themselves out of their pit and give them the tools to help them help others do the same and you can get HUGE leverage and cause massive revolutions in poverty. In other words, allow the poor and destitute to turn themselves into middle class workers and you get an upward spiraling economy that basically has so much momentum that it drags the whole society up.
