not quite water cooling but doesn't really fit anywhere else... not mine, saw this while looking for something else though:
http://www.mofocases.com/cases.php?case_id=38
completely submerged system, not that unique in itself, but the fluid's cooled with a huge TEC with a passive heatsink on it. awesome cooling, silent, reasonable cost, only compromise is power consumption at ~1kW.
extension of cool, quiet, cheap, easy etc etc pick n-1
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