How is it done?
Here is a mock-up of the Intel-only design. Trouble is, the amount of piping required means that, currently, only a handful of motherboards are qualified for usage, and many of those listed have restriction provisos.
Housed in a Thermaltake Xaser VI, the 22.2kg system is reckoned to be 20ºC better at cooling than most liquid-based systems.
We'd like to see the system concurrently cool a couple of graphics cards, and it will need to be quiet doing so, too.
If Thermaltake can fulfil these criteria and the price isn't too high, the XPRESSAR RCS1000 might just have a future.
One 'cool' thing is that the mounting mechanism will fit upcoming Nehalem CPUs as well as current LGA775s.
More info here.