retrolefty:
So first question is what is it that you are expecting to be measuring with the sensor and what will you do with the information from it?
I like to use it for emergency shutdown:
when it is higher than 350K (or so) it pulls down the alarm line... 
here it showed up before (search words: internal temperature sensor):
http://arduino.cc/forum/index.php/topic,122103.0.html