The Fire-Fly stove by Mo-Go-Gear. Made from 100% recycled materials, with an included stand that contains 30% recycled content, it perches upon the scales at a paltry 22 grams (0.7oz), yet is said to boil 16 oz (470 ml) of water in 5 to 8 minutes. For $23 USD you can get the Fire-Fly with a wraparound windshield. (The recycled materials are derived from old beer cans and spent .22 Magnum shells!)
If you don’t want to shell out 23 bucks for this kind of camp stove, you can make one yourself for about $5 and a few hours of your time. Instructions are readily available online.
The Fire-Fly will no longer be available after the last one from GossamerGear is gone.