Attack Power, Strength, and Agi

Just for you, Joe :)

Attack power increases your base DPS by one for every 14 attack power.

Each one point of strength increases your melee attack power by 2 for all classes except Rogues and Hunters. In the case of these two, attack power increases by one for every one point of strength, and also one for every one point of agility. Basically strength and agility both contribute to attack power, but at half the rate that strength alone does for all other classes.

In the case of Hunters & Rogues, +7 strength and +7 agi = +14 attack power = +1 to base dps.
For all other classes, +7 strength = +14 attack power = +1 to base dps.

Also, remember that agi has the added bonus of increasing your armor class*, increasing your chance to dodge an attack**, and of course increasing your chance to crit***. :)

Finally, a druid's feral forms' attack powers are both calculated on strength only. Even though the feral cat is considered a pseudo-rogue, it does not use the strength/agi formula to calculate attack power. The cat feral form attack power calculation is the same as that of a Shaman (see below.) If you want to increase your dps in either of your feral forms, collect + to strength gear.

Here are the specific formulae that the game uses to calculate a character's base attack power:

Warrior/Paladin/Druid Feral Bear Form Attack Power:
Character Level*3+Strength*2-20

Rogue/Hunter Attack Power:
Character Level*2+Strength+Agility-20

Shaman/Druid Feral Cat Form Attack Power:
Character Level*2+Strength*2-20

Druid Caster Form Attack Power:
Strength*2-20

Mage/Priest/Warlock Attack Power:
Strength-10

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* AC increases by 2 for every one point of agi.

** The amount increased is dependant on both class and level. For most level 60 character classes, approximately 20 points of AGI will increase your chance to dodge by approximately 1%. Rogues only require 14.5 AGI for an additional 1% dodge chance. Hunters require 26.5 AGI for an additional 1% dodge chance, but Hunters typically have a high amount of agility, as well as an Aspect spell that further increases their chance to dodge attacks.

*** Rogues require 29 AGI for an additional 1% crit chance, and Hunters require 53 AGI for an additional 1% crit chance, but both of these classes also gain attack power from agility and the items available to them typically have much higher amounts of AGI. All other classes gain 1% chance to crit for every 20 AGI.

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This post was compiled from:
-about 60% three main articles
-about 20% two smaller articles
-about 20% my own understanding and explanations

None of the articles are still available in a public location, or I'd link to them for reference.