You could make a pretty good case that Evernote is the single most important productivity app of the smartphone era. At the bare minimum, you'd have to grant th

You could make a pretty good case that Evernote is the single most important productivity app of the smartphone era. At the bare minimum, you'd have to grant that it has the potential to be. For comparison, the single most important productivity app of the PC era was either Office in general, or just Word in particular. How much are those worth?