Another entry or three, in the 'free AC' race:
Cooling Our Homes Without Electricity?
MIT combines insulation evaporation and radiation, by layering aerogel, hydrogel and a mirrored substrate.
It's basically a high tech swamp cooler. MIT uses an expensive aerogel, Universities in China and Germany have a cellulose-based aerogel that may be more viable.
There is promising research into anisotropic aerogel and single-pane insulating windows.