Phase 3 Restoration (Tree) for BT/Hyjal. Thunderheart Raiment with healing offsets (Shoulderpads of Renewed Life, Botanist's Gloves, Leggings of Eternity). Crystal Spire of Karabor and Memento of Tyrande are the big ticket items. You are the raid's Lifebloom / HoT engine and emergency Innervate battery.
Keep Lifebloom stacks perfect on the MT, pre-hot raid members before predicted damage, and never waste Innervate on yourself if a caster is dying for mana. Swiftmend is your panic button — don't sit on it forever, don't waste it on full HoTs either.
✓ Strengths
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Best sustained tank healing model in TBC
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Innervate and battle rez are irreplaceable raid tools
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Thunderheart + Crystal Spire is a smooth Phase 3 path
✕ Weaknesses
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Weak to sudden raid spikes without pre-hots
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Tree form limits some mobility / emergency options
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Competes with Holy Paladin / Resto Shaman for the same healer weapons