The nice thing about the "cheap & dirty" one is that it can be made with just a knife and single soda can, in about 10 minutes if you've built one before. Something to be said for being able to create something effective on-the-fly. I'm sure it's not as efficient as a photon stove, but it works, and can be made in the field easily.

http://hometown.aol.com/walkingfire//halconstove.htm