lost anywhere on your screen

    MiksScrollingBattleText (Curse | WoWInterface): This is a floating combat text replacement (though can be used in conjunction with Blizzard's as well) and lets you place your outgoing damage,

buy kingdoms of camelot gems

incoming damage, heals, and buffs gained/lost anywhere on your screen and with any animation you want.

wow items

 It really helps with screen clutter in AoE situations,

Little Empire Mojo

and there's something very satisfying about making your crits sticky somewhere prominently so you can always have a view of the big numbers.