Problem is, they're pretty damn scant. Any of you who tanked in Wrath... feel free to sigh and nod knowingly. So, without further ado...
Be warned, unlike my previous lists, I included profession-specific ones here.
[Heart of Thunder] Static Armor, with a Battlemaster-style on use health increase. Never been a fan of tanks using battlemaster trinkets, but the armor is quite nice. This is actually the one that I picked up earlier from Heroic Vortex Pinnacle.
[Leaden Despair] Your standard high stamina tanking trinket, with a nice little proc when you get below 35% health. I will be farming for this one as a backup. It drops from Heroic Stonecore.
[Porcelain Crab] A great passive dodge increase (4.37% at level 85) makes this worthwhile by itself, but the added benefit of proccing a HUGE mastery bonus is amazing. I am curious what the up-time on that proc is, because it could raise or lower the value of this trinket pretty dramatically. Drops from Heroic Throne of the Tides.
[Darkmoon Card: Earthquake] Unless you literally have money BURNING HOLES in your bank alt's bank account, you probably won't be coming across this anytime soon... and honestly, I don't feel it's worth the monetary cost it'll inevitably generate. Dodge (albeit a nice amount of dodge) and a battlemaster's health increase? It seems a bit underbudget for an ilvl 359 epic.
[Figurine: Earthen Guardian] Jewelcrafting only. If you're a JC, there's absolutely no reason you should bypass this. A large stam bonus, plus a huge on-use dodge cooldown... Amazing, and possibly even overbudget for an i346 blue.
[Lifebound Alchemist Stone] Alchemy only. A large amount of stam, a blue gem socket, and a great mastery increase??? If you're an alchemist bear, there's no reason to bypass this. Truly fits the i359 epic.
Welps.... that's really all there is. There are a lot of other....iffy trinkets bears could take with obscene amounts of agility and mastery... and I guess to a point it's really situational. I think taking legit tanking trinkets would be far more benefit in the long run, because heroics are [b]scary[/b] right now... I can only imagine what raids are going to be like.