Halcrow Biogas Toilet Kibera
The company Halcrow designed a biogas system for human excreta in combination with a public toilet system. I visited the project in January - it's really nice! The kids from the school next door can come for lunch, cooked on a "human-produced" energy source - how cool is that..!
Click http://www.halcrow.com/Videos/Foundation---Kenya/ link to open resource.