When looking for cheap and accurate temperature sensors for the next up and coming near space balloon project, I came across this great little device from TI. The TMP100. Tonight I interfaced these little devices with a PIC18F4520 via I2C and everything is working perfectly.
Some basic info about this sensor:
Resolution: up to 12bit
Temperature range: -55 to +125 degrees Celsius
I plan on using two of these to monitor temperature, one for the inside electronics temperature and one for the outside environment temperature.