What do ya do when the power is out, firewood is scarce, and Ol' Man Winter is freezin' ya to death? Make a solar heater out of your leftover pop cans. This guy used 50 pop cans, a wood frame, some pvc supports, and a [butt]load of caulk to heat his garage in the winter. Detailed instructions and pictures are available at:

http://blog.hemmings.com/index.php/2007/04/26/almost-free-garage-heat-just-drink-a-lot-of-soda/

bob