The Bracer enchant is a 28 stamina over Burning Crusade's equivalent: Enchant Bracer - Fortitude. That's quite the jump. While neither of these enchantments are especially interesting due to the lack of procs and things like that, they're definitely very good and I fully expect tanks to be scrambling for them as soon as patch 3.0.8 goes live.
It seems the devs took notice of the fact that many important Tanking enchants were just plain missing from Wrath, because we're getting a couple of new ones in patch 3.0.8. At the price of 5 Abyss Crystals each, you can buy the following formulae from the Shard Trader in Dalaran:
Requires a level 60 or higher item. Before Titanguard, Mongoose remained the best tanking enchant (unless stacking threat stats), which was just downright silly. It's still a good avoidance enchantment, but for your pure tanking set you can't really pass up 750 HP on your weapon, before any talents or buffs are thrown into the equation. That's pretty incredible!Enchant Weapon - Titanguard: Teaches you how to permanently enchant a melee weapon to increase Stamina by 75. Requires a level 60 or higher item. Enchant Bracer - Major Stamina: Teaches you how to permanently enchant bracers to increase Stamina by 40.