Every time I've seen that contest mentioned, I can't help but think that we homebrewers could do a better job than a lot of what they have there...
I mean, a 10-20 foot CFC with recirculated ice water would chill beer as fast as you could pour it, no problem... And judging by the looks of past entries, it would probably blow most (if not all) of them away.
It would be cool to participate, but I don't see myself going to defcon anytime soon...