Oh well.  Yeah, I didn't realize it was such a poor efficiency.  For reference, this is what you're talking about, I think:  http://en.wikipedia.org/wiki/Carnot%27s_theorem_%28thermodynamics%29.

Well, it seems like that's enough energy to power a liquid cooling system, so that you could have a self-contained cooler requiring no extra juice, powered solely off of the waste heat.  It'd be cool.  Not terribly useful but pretty badass.

Oh yeah.  I can't wait till winter.  I use so little heat in the winter, that I think what I'm generating right now by mining will be plenty.