First love this thread, thanks wish it was mandatory reading to complete your training for lvl 55.
Second was thinking as I play both healers and tanks a lot, I know that when as a healer I get aggro I run to the tank. He might not see that I have something on me but if I run in to his field of view I'm way more likely to get the mobs off me.
Then as a Tank I HATE HATE HATE it when the healer gets something on him/her then hauls *** away from me. If I can't catch you I can't get it off you.
So maybe you could mention that. OP thanks for the great post.