Feet
#Sabatons of Endurance - ?
#Kyzoc's Ground Stompers - 40xEmblem of Valor
#Plague-Impervious Boots - Noth the Plaguebringer, Naxx10
#Tempered Titansteel Treads - Blacksmithing
#Greaves of Ancient Evil - ?
#Sabatons of Draconic Vigor - Wyrmrest, Revered
#Tempered Saronite Boots - Blacksmithing



Ring
#Signet of the Impregnable Fortress - 25xEmblem of Valor
#Sand-Worn Band - Various Bosses, Naxx25
#Signet of the Accord - OS10
#Deflection Band - Anub'Rekhan, Naxx10
#Keystone Great-Ring - The Prophet Tharon'ja, Drak'Tharon
#Titanium Earthguard Ring - Jewelcrafting
#Woeful Band - Maiden of Grief, Halls of Stone (H)
#Nerubian Shield Ring ?
#Band of Torture - Drakos the Interrogator, The Oculus (H)
#Dragonflight Great-Ring - Cache of Eregos, The Oculus
#Ring of Earthen Might - Jewelcrafting


Trinket
#Defender's Code - Grobbulus, Naxx25
#Rune of Repulsion - Sapphiron, Naxx25
#Repelling Charge - Thaddius, Naxx10
#Valor Medal of the First War - 40xEmblem of Heroism
#Seal of the Pantheon - Loken, Halls of Lightning
#Essence of Gossamer - Hadronox, Azjol-Nerub (H)
#Offering of Sacrifice - Gal'darah, Gundrak (H)
#Figurine - Monarch Crab - Jewelcrafting (BoP)
#Figurine - Ruby Hare - Jewelcrafting (BoP)
#Sonic Booster - Engineering (req. Engi 390)
#Indestructible Alchemist's Stone - Alchemy (BoP)


Weapons:

2-hand Weapons
#Inevitable Defeat - Trashmobs, Naxx 25
#Titansteel Destroyer - Blacksmithing
#Death's Bite - Kel'thuzad, Naxx10
#Colossal Skull-Clad Cleaver - Loken, Halls of Lightning (H)
#Saliva Corroded Pike Moragg, Violet Hold (H)
#Sword of Justice - Tribunal Chest, Halls of Stone (H)
#Edge of Oblivion - Jedoga Shadowseeker, Old Kingdom (H)
#Argent Skeleton Crusher - Argent Crusade Revered
#Dreadlord's Blade - Mal'ganis, CoT Stratholme

#Axe of Bloodstained Ice - Quest, Icecrown
(it's good to have around if you are severely lacking in the defense)


One-hand Weapons
#Broken Promise - 4 Horsemen, Naxx25
#Titansteel Bonecrusher - Blacksmithing
#Infantry Assault Blade - Prince Keleseth, Utgarde Keep (H)
#Cresent of Brooding Fury - Quest, Zul'drak


Off-hand Weapons (DK)
#Last Laugh ?
#Red Sword of Courage - King Ymiron, Utgarde Pinnacle (H)
#Slayer of the Lifeless - Gothik the Harvester, Naxx10
#Cloudstrider's Waraxe - Varos Cloudstrider, The Oculus
#Eternally Folded Blade - Volkhan, Halls of Lightning

Off-hand Shield (Paladin)
#Valorous Scourgeborne Faceguard


Sigil
So far I haven't seen any signs of any tanking sigils...


Enchants:

Head
#Arcanum of the Stalwart Protector - Argent Crusade Revered
#Arcanum of the Defender - Keepers of Time Revered

Shoulder
#Greater Inscription of the Pinnicle - The Sons of Hodir Exalted
#Lesser Inscription of the Pinnicle - The Sons of Hodir Honored
#Master's Inscription of the Pinnacle - Inscription Only

Cloak
#Titanweave - Enchanting
#Mighty Armor - Enchanting

Chest
#Greater Defense - Enchanting
#Super Health - Enchanting
#Powerful Stats - Enchanting

Bracer
#Major Stamina - Enchanting
#Expertise - Enchanting
#Fur Lining-Stamina - Leatherworking only

Gloves
#Armsman - Enchanting
#Expertise - Enchanting

Waist
#Eternal Belt Buckle - Blacksmithing

Legs
#Frosthide Leg Armor - Leatherworking
#Jormungar Leg Armor - Leatherworking

Boots
#Greater fortitude - Enchanting

Ring
#Stamina - Enchanting Only