In just about every basic cookbook or guide, you will see the same thing: "You should always use a meat thermometer to verify that the food is fully cooked - color or cooking time alone are not enough". I'm just curious how many of you actually use a meat thermometer when you cook? I've used them once or twice, but in my experience they are not reliable at all, unless you are cooking a very thick piece of meat (aka, a whole chicken or the like). But for fish, steak, or a standard-size chicken breast, I find them next to useless.
Not to mention, for some dishes like stew or curry, it just seems silly to use a thermometer. Plus I doubt that any chefs at fancy restaurants actually use these things when they cook!