I came across this fabulous article by Madhu Suri Prakash in the Winter 2008 edition of YES! Magazine:
Compost Toilets and Self-Rule
"The ecological toilet is one of today’s most hope-filled expressions of people’s power and people’s science. These toilets—which celebrate Gandhian simplicity and ecological sensibility—recover and honor traditional practices of healing and agriculture, related arts of non-violent living.
In contrast, the abuse of water via flush toilets renders it toxic as well as globally scarce. More than 40 percent of the water available for domestic purposes is used for transporting shit."Read MORE of Compost Toilets and Self Rule....
More info & technical details at Joseph Jenkins, Inc (he's the infamous author of The Humanure Handbook) and in this interesting document out of Bangladesh: Decentraised Composting for Cities of Low and Moderate Income Countries