It's not quite finished yet but here's most of it.
My board is a Tyan Tiger MPX dual processor with two AMD 2200+ processors. The cool thing about this setup is that I didn't have to give up any expansion. I can use all my PCI slots (two of the lower slots are filled but you can't see them) and I still have all my drive bays.
The pump is a PondMaster 250 (also known as a Danner, Supreme Mag-Drive, Model 2) it has a head of 7' and moves about 250 GPH at 1' of head. I didn't measure the flow. However, I did measure the flow of a different pump that ran at a little over 60 GPH and judging from the flow I can see that the rate is lower. I'd guess about 40 GPH. The pump was 36 bucks from PetSmart.
The heater core is from a Pinto. I got it new from eBay for 15 bucks.
The waterblocks are my own design.
The heater core is cooled by a 120mm fan attached to the side panel. I'll finish mounting that tomorrow and get a pic up.