I have been reading on a book called Blink by Malcolm Gladwell. It has been very interesting so far. He talked about this thing called thin slicing that basically pointed to the fact that we could make very good, sound judgments about people based on nothing but what we observe in people. The thing that makes this tricky (because this happens on an unconscious level) is that our conscience catches up and interrupts out "gut feeling" with "facts."
It is just interesting to think that we can make good (i.e. accurate) judgments about people and then convince ourself contrary to our initial "feelings." I need to learn to trust my initial feelings.