kaluza: I applaud your sensitivity. I wouldn't go as far as to block someone!, but there is a definite pleasure in taking the last peieces off the board. If you know that that's the case for someone, it's poor etiquette to resign when there are only a couple of moves to go.
That is, unless you're playing against ....... (Fill in the name to suit yourself!) , in which case they don't deserve that respect.