I used a thermistor a while ago and I could get temp readings within 0.1C; but that was based on the manufacturer's provided coefficients and equation.
Well, yes that is true, but thermistors are inexpensive and the data sheets for major many factors are easily found. As always, if one goes through surplus junk to salvage parts, they are pretty much on their own to categorize the spoils.
For the above crowd, a late friend of mine posted another way to implement thermistor temperature readings.
http://www.phanderson.com/picaxe/lin_thermistor.html
Ray