T and I subscribe to lightweight backpacking. We've each been known to carry less than 20 pounds on long-distance trips, food and water included. One of our secrets is to hike with a pal (you only carry half the gear). Another is this awesome little soda can stove. We've had ours since 2005.
These are also called denatured alcohol stoves because they burn isopropyl, or denatured, alcohol. You can get the fuel at a hardware store, or in a pinch you can burn 90% rubbing alcohol from a pharmacy.
We bought our stove (and a pot stand) on eBay for $10 from some guy in Canada who was making them. Since then, T has learned to make them himself: a necessary skill in case you step on yours while out on a trip. Last week we had a few friends over and made some stoves.
Step 1. Drink 2 beers.
Step 2. Make the cans into a stove.
OK, so there's several more steps than that. If you want to know them, guess you'll just have to attend the next workshop. Until then, happy trails.