I thought this comment I posted on another journal fit into the bookcrossing concept well, so here it is: "I've been kicking the idea around in my head but thank you for putting it into words. To do something just because it is worth doing is it's own kind of satisfaction. To make the world a better place even if no one says 'thanks' and no one even knows you did it. To create a ripple by throwing a pebble into a pond that has far reaching consequences. Just do it...do something wonderful. Just because..."