Thanks for the quick reponse!
Yeah, I understand about the tuning parameters, I guess I'll just have to eyeball things until I get them set up right. Like I said, nothing is built just yet, it's still diagrams and connections floating around in my head. I've heard it'll probably take a long time (hours? days?) to tune due to the slow response of my systems (I'm thinking the smoker will probably be faster than the water bath though).
The Timer1 library is something I stumbled upon while trying to figure out how to slow down the arduino PWM. I think I understood the software "window" method that you wrote into the second example on the PID library page, but it seemed like there must be a better way. I don't claim to understand it completely, but it seems like just the ticket for what I'm trying to do:
http://www.arduino.cc/playground/Code/Timer1
Thanks again!
-zv