AuraToChat is a simple addon that enables you to print through Sink-1.0 (i.e. any frame that accepts text, basically) when someone gains a buff or debuff.
You select a base color and then it generates a soothing palette from that base and assigns one color to each buff, making it easy to match them quickly over time. It's based on the theory that it's easier to distinguish colors than text.
It doesn't come preconfigured with any auras, but personally I have things like Misdirection, Fear Ward, Blessing of Protection, Innervate and other small gems in it, so that as a raid leader I can easily spot when these spells are used.
For example, if a priest throws a Fear Ward on Rabbit, ATC will print "Fear Ward on Rabbit.", with "Fear Ward" colored according to the palette and "Rabbit" colored according to unit class. For Misdirection there will be two prints, one for the hunter and one for the target.