ArcDPS Addon - DMG Meter

ArcDPS Tip: See total damage of the entire squad.

Right click your ArcDPS window and under "stats" is a blank field labeled "title bar format." If you type "@1" and/or "@2" there, you can see the combined DPS and total Damage respectively of everyone in the same squad as you. This allows you to quickly quantify the performance of the group as a whole, rather than just the individual players.