I came across this while looking at www.stirplates.com, BrewTroller, http://www.brewtroller.com/

It looks very cool. It is also Open source, so you could build it yourself. But it only costs $100 for the board and 2 temp sensors.

If you have thought about automation for your brewing stand, this would be a great start.

You can also use the Source code on your own system if you are using some sort of micro controller. I plan to use some of the features for my own system.