I sat up last night and made a new toy.
I haven't done any camping in years, but I spotted this little home made stove project last year and have been wanting to build one.
I am not going to go into the specifics on the build process or how they work. There is a ton of info to be found on the internet. Here's where I got my design and plans. I will say that the unit is made from two alum cans and costs nothing to build. It also heats like nobody's business and weighs next to nothing. I boiled two cups of water in about 4 mins.
For those that have a need or want for such a stove and have that DIY bug like I do... this is a great little project. I turned my scoutmaster buddy onto these and his troop had a blast putting them together.
Looks like the pics are broken. Try here if they aren't working.