Heh, looks wicked. I should get my first water cooled rig up and running in the next few weeks. Have been waiting for my mums boyfriend to make me an aluminium case for my external stuff (rad and fans, res, pump and accompanying PSU with relay attached to PC PSU) and then I'll try it out with my blocks (they could do with a bit more lapping).
Hopefully in the future we're gonna try making some of our own blocks and if that works then maybe try making some for sale. Will be fun either way