Found this in the july/august issuse of Wooden Boat a small waterless composting toilet.
(http://www.airheadtoilet.com/Air_Head/IMAG0002.JPG)
Wooden Boat said its just dead simple, and we love it.
And the price
Airhead Dry Toilet, complete unit: Toilet: bowl, solid tank with agitator, liquid tank, (color: sand), crank handle, Composite wood seat, (white), Anodized aluminum bowl ring, Hold down brackets, Mounting hardware, Hose, 5' length, Hose connectors, Fan/bulkhead shroud, Paper bowl liners, (50), Organic desiccant starter bag, Instructions, Philosophy, A few bad jokes.
$879.00
http://www.airheadtoilet.com/Air_Headx.html
Did you buy one?
(it's not terribly expensive by composting toilet standards, even if it's not a composting toilet, it might work in place of one in a small system)