I think this covers almos everything
http://sunnierbear.blogspot.com/2011/12/heroic-yorsahj-10-tanking-guide.html * Druid
o Effloresence - NO STACKS
o Lifebloom - 1 stack per application.
o Rejuvenation - 1 stack on initial application
o Swiftmend - 1 stack on the person swiftmended.
o Tranquility - 1 stack per tick (i.e. a raid killer)
o Wild Growth - 1 stack for each person hit by Wild Growth
o Feral Tier 13 4-piece (unglyphed Frenzied Regen) - NO STACKS
o Leader of the Pack - NO STACKS
* Shaman
o Chain Heal - 1 stack on initial hit only
o Healing Rain - 1 stack upon entering. If you leave and re-enter, you gain another stack.
o Healing Stream Totem - NO STACKS
o Riptide - 1 stack on initial application
o Spirit Link - NO STACKS
* Paladin
o Beacon of Light - NO STACKS
o Holy Radiance - 1 stack for initial application (i.e. if it hits 4 people, 4 people get 1 stack).
o Word of Glory - NO STACKS
* Priest
o Atonement - 1 stack
o Divine Hymn - 1 stack per tick (i.e. will wipe your raid)
o Echo of Light (Holy Mastery) - NO STACKS
o Holy Word: Sanctuary - 1 stack upon entering. If you leave and re-enter, you gain another stack.
o Holy Word: Serenity - 1 stack
o Lightwell - 1 stack per buff gain (i.e. when the person clicks)
o Penance - 1 stack for the whole channeled cast (i.e. not 1 per tick)
o Power Word: Shield - 1 stack (even when glyphed)
o Prayer of Healing - 1 stack
o Prayer of Mending - NO STACKS
o Renew - 1 stack on initial application
o Priest Vampiric Embrace - NO STACKS
* Deathknight
o Deathstrike - NO STACKS
o Bloodworms - 1 stack
* Other Abilities
o Hunter Chimera Shot - NO STACKS
o Rogue Recuperate - NO STACKS
o Warlock Healthstones - NO STACKS
o Scales of Life trinket - 1 stack