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Also I dont quite understand why heatpipe coolers have many sealed tubes, and never have a waterblock like thing, filled with coolant, with the pipes connected to it... wouldnt it be work a lot better?
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Heatpipes must be sealed in order to work. Exposing them to air would allow the coolant (usually distilled water) would evaporate. Actually that wouldn't be the problem. The problem with exposing the coolant to outside air is comprimising the low pressure inside the heatpipe. This low pressure allows the water to boil off at a lower temperature and thus communicate the heat to a larger surface area. The type of design you would like to see is realized in skythe's new HFC-134 based cooler found here:
http://www.performance-pcs.com/catal...oducts_id=2049
Frosty tech recently reviewed it here:
http://www.frostytech.com/articlevie...articleID=1645