The problem I see in these recent discussions about internal and external movement is that people are using external concepts and principles to try and explain internal stuff; and this includes some of the IP/IS folks as well - there are fundamental differences between the two - look at my tag line for a clue as to what I am talking about - and then go out and feel someone that has it and can explain it in person - then come back and dissect it from that experience perspective if you like.
Greg