The crazy kids at Toms Hardware who built the solar powered wii took a little flak from their readers for building a device that could not quite get by on solar power (which they could have fixed easily just by adding more panels) so they went back to the drawing board to develop a fully solar powered gaming device, just what everyone needs when the great outdoors gets boring.
In this case, they took a Nintendo DS, and added folding panels that produced enough juice to run the nintendo without its internal battery. When the battery is installed it can charge from the panels for use under the covers at night. Given that the panels are about the same size as the unit, it folds up nicely. Proof that there is nothing under the sun that can't benefit from a little free juice. ::Toms Hardware via ::the sietch