This is pretty cool.  National Geographic has a post about how solar heating is changing lives in developing countries.  I took a look around online I was amazed at how effective solar cooking can be.

This low-cost, high-performance solar oven can produce cooking temperatures within an hour in full sun and be used for up to six hours; perfect for baked goods or slow-cooking stews. The Hot Pot Simple Solar Cooker includes a 5.3 quart enameled steel pot. The aluminum reflector sides fold down for easy storage. The oven can reach temperatures up to 350-400 degrees. Sales of the Hot Pot help subsidize the distribution of this device in developing countries to reduce deforestation and respiratory disease caused by traditional cooking methods.

You can find out more about solar cooking and hot pots over at Jordon Cooper Outfitters.