The EVOLUTE™ has world leading water efficiency, using less than 1 liter of water, whereas a conventional toilet uses approximately 6-12 liters per flush.
Recently, Australian inventors Tom Trainor and Mark Hutton came up with a product that they claim uses up to 90% less water than a regular toilet. The EVOLUTE is still in the development phase, and is not expected to be available to the public until 2012.
Not a bad idea, eh? I think these guys will be very successful!