Very nice, pretty wide though, wouldn't fit on my motherboard (Epox 8kta3+) without hitting the chipset heatsink, and hanging 10mm over the edge of the board on the other side.
But on a motherboard that it would fit on it'd be a goer
I'm getting a bit bored with labyrinth style waterblocks, when i get around to making another one I'll try a finned design, mabie including the 1 in 2 out style of yours.