I wanted to share an addon I recently found. This is so much better than scouring wowhead and having all my macro slots filled with /run print(IsQuestFlaggedCompleted (qid)). [For rare vignettes an treasures. ]
Another one I use [as long as I'm sharing ] is
It adds item id's and npc id's to their respective tool tips.
In the interest of completeness, wholly and grail are pretty useful too.