as for liquid nitrogen, u gotta keep in mind what your working with. I bet that stuffs as expensive as hell, maybe volatile to handle, and possibly even dangerous. It does work though
Man if I could get water cooling I would be overclocking everything like no other. I would get a 3000+ to run at 4200+ speeds, and my I would make a 6600GT run like a 7800GTX (maybe not that far)
actully it is if u spill it on your self u wont fell it becase it instanly kills nerves.I saw it on a web site these guy had some extra LN left over and frze hame with it and when it droped it shattered like glass.
Now if spilling this shit on your leg will make u minus a leg so yes it is dangerous.
I will post a link when i find it.