With 3.0.2, we're all back to pre-Kara days of armor while having really huge amounts of stam, strength and random stats that don't mean as much as they used to. Sniff, sniff...I'll miss you most of all, agility.
First off, all PvP gear in 3.0.2 retained its bonus armor. This means that the brutal dragonhide set is by far the best gear for tanking (save for the broken harness of Carnal Instinct, which presumably just missed being nerfed). Vengeful is pretty good too, especially certain pieces. You'll trade some agi and some strength, but if you can replace the gloves and the helm or chest with vengeful/brutal pieces, you should be a bit better off for mitigation.
But who cares about that? Let's go for the big leagues. Let's go for...
Living Root of the Wildheart.
This little gem drops from Hydross. Most everyone ignores the thing; after all, proc rate trinkets are unreliable at best, and this looked like another one of those examples where somehow, Blizzard expected a druid to be tanking, doing cat stuff, blowing crap up and then healing all on the same go. Those usually suck, right? I mean, look at the asstacular Ashtongue Talisman. I think I went and looked up what this did a long time ago and then ignored it from then on. I mean, the bear version isn't special when you're armor capped and the cat version only gives 64 stre...
Wait a sec.
We're no longer armor capped. We're not even close to armor capped any more.
And this proc gives 4070 armor.
I haven't tested this live yet. What the comments say is that the proc rate appears to be about 3% per swing, lasting 15 seconds, and that with a normal bear attack rate you can expect about 50% uptime. 2000 armor, amortized over time, is a really large win; this gives more armor than badge of tenacity does on average.
It'll be hard to give up something like the Commendation, but right now this is strictly better than Moroes (as it's up more often) and is probably better than badge. It'll help a lot with dealing with post armor-nerf blues. Check it out if you haven't.