Gates Foundation: Reinvent the Toilet Challenge (One page letter of intent)

The Reinvent the Toilet Challenge is designed to prototype a means of dealing effectively and cost-efficiently with human waste for the 2 billion people on earth who currently lack access to safe and affordable sanitation. Foundation is soliciting letters of inquiry and capability declarations from groups, primarily in the academic sector and from for-profit organizations, who are well qualified to undertake R&D and execute pertinent program plans.
http://www.gatesfoundation.org/watersanitationhygiene/Pages/rfloi-reinvent-the-toilet-challenge.aspx