I am putting few publications for debate and discussion and also to start the topic rolling. http://www.nariphaltan.org/USF2007.pdf
Also an interesting innovation for cooking and lighting in rural areas. http://www.nariphaltan.org/lanstove.pdf
However any innovations for rural areas should be done with a new thinking on how to curb our greed for resources. With reduction in our consumptive lifestyle huge resources can be made available for rural poor which can raise their quality of life.
Some topics on these lines can be found at; http://www.nariphaltan.org/writings.htm