Adding on to my post from yesterday, I wanted to point out a few things that the Fury tree has going for it when being put in a tanking position for your group on your way to 70.
5/5 Unbridled Wrath - Gives you a chance to gain 1 rage every time you hit the target with a melee weapon. Since we need rage to hold aggro, this helps a lot.
1/1 Piercing Howl - Dazes all enemies near the Warrior reducing movement speed by 50% for 6 seconds. Warriors have a harder time than Druids or Pallys holding multiple targets so sometimes healer aggro is a problem. If you get enough rage, pop Thunderclap then Piercing Howl to make it easier to pick up the stragglers. At 10 rage and no cooldown it's a winner.
3/3 Blood Craze - Anytime you are critically hit (melee or spell damage) you regenerate 3% of your total health over the next 6 seconds. Since you'll be taking more punches in the face than anyone in your party (excluding the Mage of course) you'll be getting crit a decent amount pre-70. Any extra healing helps.
5/5 Enrage - Also procs every time you are critically hit and increases all melee damage you deal by 25% for 12 seconds or 12 swings (whichever comes first). More damage = more threat and more rage. More rage = more threat.
5/5 Flurry - Increases attack speed by 30% for 3 swings after you deal a critical strike. This increases rage generation and also has a chance to proc Unbridled Wrath more often.
1/1 Sweeping Strikes - 30 rage gives you 10 swings to hit an additional nearby enemy. This is more rage-efficient than spamming Cleave and also causes your Heroic Strike to hit other targets to cause more aggro.
3/3 Precision - +3% chance to hit with melee weapons. +hit is a given for any melee class, tanking or not.
2/2 Weapon Mastery - You will get disarmed.. a lot.. this reduces the duration of all disarm effects by 50% normally dropping it to about 1 or 2 seconds.
1/1 Bloodthirst - 30 rage to deal X amount of damage (based on attack power) and heals you for X amount for the next 5 swings. Since you'll be taking more damage than a Prot specced Warrior you'll need all the help you can get.
I might make a post later going in to the Arms tree, but we'll see.