um. ACTUALLY, intelligence affects healing in a manner that seems to be amiss...If you want to talk about "intellect", that's one thing. Intelligence? Well, my good man, intelligence affects the way you use what god gave you. Intellect = mana pool but ALSO, if you have the holy talent "Holy Guidance", then your healing increases by 35% of your intellect
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Spirit increases rate at which said pool is regenerated.
--sort-of. If you're beyond the 5 second window of casting, then the spirit-affected mana regen rate is applicable. Otherwise, if you're within 5 seconds of your last cast, your mana regen is affected explicitly by mana-per-5-seconds gear.
Yes, as others have mentioned, you want +heal, spellcrit, and mp5. The spellcrit is most helpful if you've taken the holy talent "Illumination," which returns mana = to 60% of the base cost of the spellcast.
One last note. If you're lazy and don't feel like gearing up, just find a warlock with fel armor and an alchemist's stone trinket and have him tank for you :P
Orgasmic ego-stroking for any healer.