Gizfactory.com shows a solar still that makes sea water drinkable.

Designer Gabriele Diamanti,developed a fascination with global water scarcity as a graduate student at Milan Polytechnic in 2005, he recently decided to pursue his interest again and the result is Eliodomestico,an open source variation on a solar still. It functions by filling the black boiler with salty sea water in the morning,then tightening the cap. As the temperature and pressure grows,steam is forced downwards through a connection pipe and collects in the lid,which acts as a condenser,turning the steam into fresh water. Solar stills are not a totally new concept,but it is rare to find these in a domestic environments. The designer feels these can be used to serve communities. [continue]

Pretty spiffy! Many thanks to the reader who wrote to tell me about this.