Zurgat

A cauldron and seperate potions for damage mitigation, 2-3 warlocks for different size health stones.
Each warlock can give you up to 3 types of health stones, though you may want to reserve this for important classes such as priests. A Soulshard stockpile only last so long otherwise.

The [Cauldron of Major Arcane Protection] lasts for 5 minutes, so it's cost efficient to place them at 3-4 corners around the boss when the fight starts. You'll be able to use a potion early, and as much as 2 more if your cooldown allows it. We used the same method at mother shahraz.

Properly spreading out has always been an issue for our guild though, so i suspect we'll spend a lot of time on her.

It's highly preferred to have a protection spec paladin for the skeletons.
We've got experience with using a holy paladin with tanking gear for both tidewalker and a lot of hyjal trash, but it just doesn't compare to an actual prot specced paladin.
Especially some of the more recklessly seeding warlocks were pulling aggro quite regularly compared to the other paladin.

For healers, about 9 would be recommended for learning the fight, 2 paladins, 3 priests, 2-3 shamans, 1-2 druids.
Shadow priests can use mass dispell as well if you are short on holy priests.

Some more info at bosskillers
I'm curious why some guides mention nature resistance on the offtanks when bosskillers lists most of her abilities as being non resistable.
Felmyst - WoWWiki - Your guide to the World of Warcraft for example mentions it being needed, but then contradicts itself a few lines later about not needing it.

Well, there was the old "tranq shot" thing for MC and BWL.
Rogues for Reliquary of souls while not mandatory, makes the first phase a lot easier.
Shaman tremor totems at archimonde.
I wouldn't say it's just not done.

Edit: Fixed a silly misconception.

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