Mark - you just have to give this a go...
http://www.youtube.com/watch?v=W4QYPIlMnVQ&feature=related
Insane. But it begs the question - WHY??!!
Perhaps he lives & images from inside a volcano...!!!!!!
It's just a bit over the top methinks and might add significant weight to the camera.
I haven't used my Peltier modded 350D for ages. Since I started to do fast focal-ratio imaging ( F/2.8 ) using the Bananascope, the dark current is no longer a limiting factor in my imaging.