An excellent little guide with some really funny humor about having to heal in end game raids. Even though it's tongue in cheek at points the overall guide contains some excellent info.

It takes a special type of person to play a healing Priest. A crazy person, to be specific. Why would anyone want to put yourself in such a position of responsibility? Perhaps it is the encouraging words they receive when someone in their pickup group dies, or the friendly shouts of "OMG HEAL NOOB" they so often heard while leveling up.

You can check out the whole guide here: A Veteran Priest's Guide To Endgame Healing or "How To Keep Group mates Alive and Moderately Happy in a Deadly Azerothian Environment".