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An LN2 cooling system is completely different from a water cooling. You should try and contact the guys who did it, see if they can give you any tips/hints. I would do it right now, but my money needs to go other palces first. I rig like that would cost a pretty penny, not to mention how many things you'll break in the process of perfecting it. If you've got the cash, just do it and don't be afraid to break stuff.
I'm pretty sure that the LN2 is never touching the cpu directly, just like a water cooler doesn't. THere has to be some sort of LN2 black that straddles the cpu. And don't forget that the cpu isn't the only thing that needs cooling, you've got all the other components on the mobo to worry about.
Condensation is what I think the hardest would be. How do you get rid of it? There will be signifigant condensation no matter what kind of insulation you have.
And as to a limit for ocing a cpu, there certainly is. The temps are what would limit the cpu, so if you can keep it cool, then you're set. Not only that, but the colder a conductor gets the more effiecient it is. I wonder how many cpus and other components they burned.
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