There were quite a few enchantments that lasted through, i can't exactly remember them right now though.
Originally Posted by Morbidity
The Halion 25h trinket for tanks was superior to the cataclysm trinkets, because of the high +armor. But they adjusted it some weeks into the expansion.
Originally Posted by Vladimeir
the viscidus val'anyr trinket.
i still saw people using it in wotlk. dont know how good it was then but i saw it a lot more in BC on disc priests.
There was a flask from vanilla that was good for holy pallies in wotlk.
Herald of the Titans
Only cleared MC and BWL in vanilla, from those instances one of our tanks was using Thunderfury for long time in TBC because of its proc.
Originally Posted by Someoneelse-Xavius-EU
Mark of the Champion, the quest reward from the Phylactery of Kel'Thuzad, was a best in slot trinket for DPS casters vs undead and demons which Hyjal/Black Temple and Sunwell had TONS of.
85 static spellpower.
Darkmoon card: Blue Dragon. Used it for whole TBC as resto druid, insane upkeep partially due to class specific healing.