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[curiousl]

gizmag writes:
  The Propelair WC uses just 1.5 litres per flush compared with the 9 litres used by an average UK toilet– in one household alone, this can save 5 tonnes of water per month.

The Propelair system looks like a conventional toilet and is used in the same way. It has a sealable lid that allows air to force waste and a small amount of water from the bowl, giving improved flushing and drainage performance. The system generates its own air, requires no ancillary equipment and connects to existing plumbing, but can also connect via flexible waste-pipes for awkward installations … and uses one sixth of the water used by a conventional toilet system. The inventors is seeking sanitary ware manufacturers and investors with a view to putting the Propelair system onto the market. It is also seeking a partner for a large-scale UK-based trial of Propelair in a commercial or public building.

Phoenix believe that water conservation technology like Propelair offers a cost effective and more easily deployed solution to water shortages than major capital investment in new water supply facilities.

Moore adds: “The Water Research Centre estimates that even a modest uptake of the Propelair system could create a saving of 140 million litres of water daily, the same volume of water that Thames Water’s recently proposed desalination plant in East London could produce in a day.”

Added bonus: no more arguments over "toilet seat up / toilet seat down" -  either it is closed or it just smells bad.
 

Afterthought 1. How much electricity does it need? No figures found on site.
Afterthought 2. New appliance is said to fit existing drains. Somehow I thought these drains were planned for a given "density" of the waste that goes down. Now they change the liquid fraction substantially and drainage is not affected?!