I don't use a thermometer on pork chops, I just eyeball it. But for roasts, I do use a thermometer and cook to 150, then let it rest. It is a lot tastier when it's not overcooked!
You are not supposed to eat RAW or undercooked pork because of parasites, mainly trichinosis. http://en.wikipedia.org/wiki/Trichinosis
I know you're not supposed to feed raw pork to dogs for this reason, I'd guess it's the same for chickens? Imo, why take the risk?
That said, I've given my...