I had been asked about how things were tied together, so I threw together a little diagram here. This represents 1 completed chamber. When I finish with the others, here are the quantities of devices that I expect to have installed:

(1) HA7Net Ethernet to 1-Wire bus master
(2) Hobby Board 4-port 1-Wire relay switches
(12) Dallas/Maxim DS18B20 1-Wire temperature sensors
(3) Fountain/Garden pumps like you find at Lowes/Home Depot
(6) 120mm 12v PC cooling fans
(3) Swiftech MCR-220 radiators for water cooling PC's

The HA7Net is really the center of this whole thing. All 1-Wire devices stem from it. It provides an HTML interface for interacting with the 1-Wire devices, so programming for things like detecting temperatures and flipping the switches on the relays is pretty easy once you get the hang of it.