That's a pretty interesting article. I wonder if it would be possible to do the same thing with other animals... or possibly humans? Don't know why you'd want to, but it'd be a great party trick, "Heya babe, look at me. I can cut my head off, and live!"
No, I had a theory a long time ago that chicken are too stupid to realize they're head has been decapitated, hence they live until they do realize it. But this one must be retarted.