Well this site has the info on adding sensors for MBM using the SMBUS,
It works great and its simple
http://www.madhacker.org/mbmsensors.htm
I dont have much of anything as far as building the probe or the calibration of it.
I am thinking that you could use one of those IR thermal guns to compare your sensor readings with a know good reading,
then you could add a resister (or trim pot) in the line to adjust the sensors reading to match the known good temp from the gun ?