Wasn't this added to the game? (displayed in tooltips for the quest item/mob)
/edit: in any case, this addon should still work:
http://www.wowinterface.com/download...50-Quecho.html
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"You'd be surprised how many people violate this simple principle every day of their lives and try to fit square pegs into round holes, ignoring the clear reality that Things Are As They Are." -Benjamin Hoff,
The Tao of Pooh