I want to know if this page (article) is ranking on any keywords.
Google Analytics and other tools will tell me what keywords are driving traffic to a site, but not at a single URL level (without setting the tracking up to that level). I also can find lots of tools to let me see if a keyword is ranking and at what rank.
But I want all of this from the opposite direction. I have the article URL, I want to be told what keywords are working for it.