Thought you lot might be interested in my concept block I had made up.
Fins/channels are 1mm wide (0.04") and 5mm deep (0.20") and 30mm long (1.2"). Baseplate thickness is 1.25mm, with the main cooling section of the block just 6.25mm high (1/4").
Water goes in the middle and out the two sides (which are reconnected later with an external Y piece).
The block design itself was arrived at through use of a thermal simulator that I wrote in C on Linux, with thanks to BillA, Aesik and Les for prompting me to think harder on various ideas.
The block is made out of 99.99% pure copper, and the internals have been bead-blasted which gives it that pinkish color.
Anyways, here's the pics. Would like to know what you guys think. (Oh, BTW that's a DD Maze 3 beside it)