It's not ready for the masses. Heatpipes have just moved into the Dell arena, and they've got a long way to go before water becomes viable, if ever. That Dell solution I saw was two heatpipes (not centered...) in an aluminum sink that's still on the board. If they centered three of them right over the middle and had the pipes running to a 2*80 (or 92)mm heatsink (closer to radiator, actually) thing at the exhaust (like the Shuttle) they could get much better performance, and that'd still be in aluminum... Also, heatpipes add another TIM joint (between the heatpipe and the sink) and that will be fixed in due time, with the heatpipe built into the heatsink (cavity in the middle, hollowed out, same thing on the other end)
Intel's low heat projects will put watercooling back several years as well...
It's a long way to watercooling if the world ever gets there...
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