1. A method for annotating a printed document having preexisting content, the method comprising: identifying the printed document having preexisting content, wherein the printed document is printed from a digital document having a corresponding digital version of the preexisting content; electronically capturing handwritten annotations on the printed document using a smart pen; associating the captured handwritten annotations with the digital version of the preexisting content; and storing the captured handwritten annotations in association with the digital version of the preexisting content as an annotated digital document.