Very good information about tanking as a warrior.
Full article at:
http://elitistjerks.com/f31/t18771-protection_warrior_guide/CONTENTS
I. Introduction
II. Frequently Asked Questions
III. An Introduction to The Protection Warrior class
IV. Basic Stats
V. Armor
VI. Defense and Avoidance
a. Defensive stance
b. Avoiding the crit
c. Understanding the Combat Mechanics of WoW
d. The crushing blow
e. The Exponential Returns of Avoidance
VII. Hitting the boss
a. Weapon Expertise
b. Hit rating and spell interruption
c. Parry Mechanics
d. Boss avoidance
e. Taunt and Focus Mechanics
VIII. Maximizing your threat – Rotations and Decision making
a. Threat from your abilities
b. Rage generation
c. Skill Rotations
d. Decision making
IX. Maximizing your Mitigation – The Defensive Style
a. Talent Selection
b. Skill Decisions
c. Itemization
d. Rings and Trinkets
X. Maximizing your Aggro – The Aggressive Style
a. Talent Selection
b. Skill Decisions
c. Itemization
d. Rings and Trinkets
XI. The "DPS" warrior tanking guide
XII. Weapon Enchants
XIII. Armor Enchants
XIV. Gem selection
XV. Consumables
XVI. The Windfury Totem (vs GoA).
XVII. Raid specific buffs
XVIII. Raid specific groups
XIX. Professions of the Protection Warrior
XX. A List of Bosses, and Recommended Style
XXI. Tanking Macros
XXII. GUI
XXIII. News