WowAce

Basic tank mitigative CDs:

Divine Protection: 498
Shield Wall: 871
Barkskin: 22812
Icebound Fortitude: 48792
Anti-magic shell: 48707

(Glyph'd) Hand of Salvation: 63871 (I think)

Unbreakable Armor: 51271
Bone Shield: 49222
(The above two talented CDs I'm a little unsure of, because they're also used as DPS cooldowns by non-tank DKs)

Tank 4pt10 bonus mitigative CDs:

Warrior - Stoicism: 70845
DK - Blood Armor: 70654
Paladin - Deliverance: 70760
Druid - Enraged Defense: 70725

Optional extras:

Hand of Sacrifice: 6940
Dispersion: 47585
Safeguarded Intervene: 46947
Divine Sacrifice: 64205 (I'd argue this one should be shown because the paladin casting it may not always pair it up with bubble or divine protection to reduce the damage redirect - something healers would probably want to know about so they can try to heal them)
Divine Guardian: 53530 (I've read it's possible to macro a cancelaura with the divine sacrifice cast, such that you can remove the damage transfer but keep the group/raid damage reduction aura in effect. I'm not sure if this should then be shown on everyone, or just the paladin who put it up)

HP-increasing (quasi-mitigative) CDs:
Last Stand: 12975
Survival Instincts: 61336
Vampiric Blood: 55233
Ardent Defender: 66233 (I think)
(Glyph'd) Frenzied Regeneration: 54854 (I think)
Guardian Spirit: 47788

I've found it easiest to set them up on an icon indicator just to see which ones they are at a glance. I'm not yet sure on what priority you'd want them, either showing the weakest on top of the stack, or the strongest.

YMMV, but I've also found it easy to track the HP increasing CDs by associating them with side-bottom-right, which is created via Grid2StatusTargetIcon.

These are in under aura group as 3 sets of mitigation statuses. They still need a location assigned to them though.

Ok, for now they get corner-bottom-right. I will check that in as soon as it is raid tested. It will also alter AuraGroup to show the triggering icon when used on an icon indicator.