The remote thermometer.....the kind you leave the probe in the meat, then a cord goes to the temperature read-out outside the oven. Lets me cook to an exact temp, not have to open the oven to check.....saves me from overcooking when distracted since thermomter beeps when pre-set temp is reached!
Someday, I'll get one of the nifty infrared remote thermometers like Alton Brown uses!