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I once tried sticking my 30D in the freezer for a few hours and then taking some photos with it. The reduction in noise was amazing....
The main issue was condensation and the secondary issue was kepping the camera cold for a few hours, so I've been thinking of making a jacket out of something - wetsuit material or something - to provide a bit of insulation and making sure the whole thing is well sealed inside a plastic bag or something.
As for stopping condensation on the sensor (or rather the filter over the sensor), that's easily done by just sticking a T-adapter with a 2" filter (clear or Halpha or whatever) on it and purging the air inside the space with a dry gas. The gas inside provides enough insulation to keep the sensor cold for a while and prevent condensation. But I would probably also stick some silica gell inside too.
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