Here are two urls I found when it was first mentioned:
http://www.phanderson.com/picaxe/lin_thermistor.html
http://www.phanderson.com/picaxe/picaxe_thermistor.html
Again, unfortunately, I have no documentation at all on my thermistors (I bought 5), so I can't assume anything about them. Anything within 1'C is fine by me. My current R2 is around 0.98x from what I remember.