Wow! I thought I was the only one who wanted to build one of these!!!
I am a very good programmer with some breadboard stuff type experience too. I can handle all the interface design and higher level programming, however I think finding people to help there won't be hard. I can do some circuitry and most of the assembler, low level stuff, if you need me for it.
Rather than starting with anything too complicated, I think we should start playing around with various materials to build the probes. Once we have a probe, we can figure out how to hook it to a PC and get accurate readings.
We also need a device that can turn a standard voltage outlet on or off with a low voltage signal. Similarly we need something that can turn on and off a plumbing valve electronically.
The key point is not just building a controller, the key is building a controller that is reliable, cheap and relatively simple in design.
Lets make this project "open source" meaning anyone can read how we built our work, contribute ideas, and add components.
e-mail:
brad@bellomo.org if you want me to work on something that will help you, or if you built a probe.