http://www.aidg.net/

One in 3 of us, roughly 2 billion people don't have basic services such as electricity, sanitation and clean drinking water. Access to these services is essential to breaking the cycle of poverty in developing countries.

The Appropriate Infrastructure Development Group (AIDG) helps individuals and communities get affordable and environmentally sound access to electricity, sanitation and clean water. Through a combination of business incubation, education, and outreach, we help people get technology that will better their health and improve their lives.

--From the Appropriate Infrastructure (http://www.aidg.org/) group's website

Lots of extremely useful DIY stuff there.