BioLite Camp Stove  

While somewhat impressive, Im not sure if this video shows the thing working properly.

I thought the idea of these things was that the heat from the burning coals is drawn down thru a relatively tight mass of material which releases gas which is then burnt as a blue flame (not yellow) at the top. This gives a longer burn time without the need to top up.

I thought (from the video) that all this thing does is force air through the fire to make it burn hotter...