Intel does watercooling

Intel is working on watercooling systems that are quite similar to those we currently have in a high end G5.

Those systems are also very compact, with metal pipes, and can't be reloaded.
If Intel insists on the CPU overclocking, those kits, that Apple could take advantage, will mainly allow to decrease the noise of the machines by deporting heat to places where you might install a new fan that would run more slowly.