I'm still waiting for the backpacking version to come out.
I kid, I kid. Low Tech magazine is always very interesting and mind-opening (it's been mentioned here before).
The oven stove is a very old and effective concept, using high temperature burns and massive thermal storage. Modern designs are based on the rocket stove / rocket mass heater concept (which you can build yourself).
I'm actually interested in building one of these rocket mass heaters as the basis of a greenhouse. That is, you don't put a stove in the greenhouse, you put a greenhouse around the stove. Given the endless supply of scrap wood and trimmings from my property, and clay for the digging, it seems logical. I would like to mod it to have an oven space for baking bread (or pizza), which would be uber-cool (and tasty too).