So now you have a 3pt WoG chambered...where to use it? Again, in order of preference:
1. The target getting ready to die. If there's more than one in this condition, the tank generally wins the tiebreaker (UNLESS the boss is on fumes and you can safely sacrifice the tank to give your DPS just a few more seconds to bring him down). If the tank's okay, then you should probably be next (UNLESS, again, the boss is on fumes and you can sac yourself to give the DPS a few extra critical seconds). If you and the tank are okay and multiple DPS are preparing to cash it in, use it on your best DPSer. If you can't figure out in a split second who that is, hit a melee DPSer. (Why? They will generally have more life, and thus a few more seconds of survivability, and probably won't be running on fumes like your ranged clothies might be. But as always, YMMV, this is what works for me.)
2. If no one is in immediate threat of dying, but multiple targets have significant damage, ask yourself if the tank will live if you don't use it on him - if your gut says 'no' that's who you should cast it on. When in doubt, you usually can't go wrong healing the tank.
3. Next best choice would be a melee DPSer, because they seem to take almost as much damage as the tank sometimes, and are less prone to being overhealed - make every point of healing count!
4. Next choice is the ranged DPS, and finally the pets, although keeping a pet up when all Hell is breaking loose is a luxury, not a requirement. Yeah, losing a pet costs you some DPS, but losing a player loses you a lot of DPS, if not the encounter.
If your WoG procs Eternal Glory, fantastic! Triage and use it, then quickly rebuild your stack.
Know where your Lay on Hands button is - this is your honest-to-God OH SH*T button now. Use it on the tank if he's swirling the drain, or even better, on a melee DPSer who's swirling the drain because Beacon will still heal the tank to full most of the time.
Holy Radiance? Situational. If the fight presents you with the opportunity for the group to pull in tight to a spot, such Erudax' Shadow Gale, use it. Otherwise, it's too expensive for the healing you will do, even if you run around in little circles trying to hit everyone.
Light of Dawn? Almost never use it. Directional issues, aside, if my group is nicely bunched, I'm using Holy Radiance. That 3 stack is more valuable to me as a single target WoG than to hit maybe two or three of my targets for a fraction of that amount. Again, YMMV, but I've not had good luck with it.
Divine Plea? Only if I'm dead out of mana or everyone's in a safe place for a few seconds and does not need significant healing. The latter doesn't happen often, but it does happen.
Holy Shock is healing clothies very nicely right now. If the tank can spare it, these should go to your clothies. The tank will still get the Holy Power.
Make sure to spread your heals around; bringing everyone to 50% is better than one person to 100%.
Last bit of advice: I'm using Spirit food, leftover Mp5 flasks from Wrath, and a pair of Spirit trinks that I roll whenever they're off cooldown. It's tough, but I'm holding my own.
Anyway, that's all I can think of for now. Hope it helps someone. Good luck.
Edited by Alysandir on 12/12/2010 2:56 PM PST