CD, you're right on many points, but there are blocks of that design being made, by individuals!
A spiral may not have 90deg bends, but it does have a resistance to flow. I referred to 90 degree bends because they're an easy way to calculate flow restriction. Spirals are a whole different ballgame...
Some of the most ingenious designs call for posts coming up from the center of the water block (inside). They offer more surface area that way.
Their designs are limited by the tool though, so you can forget about the finned, diamond island. (nice idea though).
Thanks for the link TiTch, I'm glad to see some more people come around (to the dark side?!?)
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