DrDamage calculates the average damage and healing of your spells based on talents, gear and buffs, and shows those numbers directly on your action buttons and in spell tooltips.
How to use:
Install and enable the addon, then type /drd, /drdmg or /drdamage to open its options and choose what values to show on buttons and in tooltips; after that, just hover spells or look at your bars to see updated calculated damage/healing.
