Anyone who prides themselves on efficient subway travel has figured out precisely where to stand on the platform in order to best situate themselves for a speedy exit or transfer once they depart their train. It's a talent sharpened through dedication, a good memory, and a passion for being in the subway for as little time as possible. Now, an enterprising entrepreneur has created an iPhone app that allows anybody to figure out their optimal platform position in any subway station in Manhattan, and some in the outer-boroughs. It's a great idea, though we can't help but feel a little embittered that tourists and the formerly indifferent can now easily match our hard-earned subway canniness. [City Room/NYT]