I was at an event at work today run by the permaculture network and the brought along a "Rocket Stove" I had never seen one before but I was amazed by it's simplicity and it's efficiency. It could cook a meal using 3 or four twigs !! I'm told it is almost 70% more efficient than an open campfire. I have found a video which shows the building process that I'd like to share. I don't think the stove is good for backpacking but it's ideal if you have a vehicle... Link below
http://video.google.com/videoplay?docid=797446823830833401
http://video.google.com/videoplay?docid=797446823830833401