Nice work wymjym!
I also believe that the redundancy aspect is very important. Right now, I'm leaning towards a flow sensor (not to be confused with a flow meter). I will most definitely add a relay to start the pump. My goal is to make the water mod as transparent as possible, so that the computer can be used like any other computer.
As for a TEC (MadDogMe), well, that's where it gets tricky: if your cooling solution is pretty extreme, and you've seriously overclocked your CPU, you might need a startup sequence where the pump and TEC turn on first, cool the CPU to the starting temp (which won't be ambient), then fire up the computer. It's not hard to do, but it is a little bit of work, especially to merge that with the above.
As usual, everything should be transparent: you don't want to flip 2,3 or 4 switches to turn your comp on!
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