Attack power

Attack Power

• Attack power increases your base melee DPS by 1 for every 14 attack power.
• Strength increases your melee attack power by 2, except for rogues and Hunters. Rogues and Hunters gain 1 attack power per point of Strength, and 1 per point of Agility.

Source - http://forums-en.wow-europe.com/thread.aspx?fn=wow-general-en&t=148612