Why I carry a paper notebook<p>Battery life - infinite<p>Handwriting recognition - I can recognize my own handwriting.<p>Document centric workflow - The document is definitely front and center.<p>Share Everything - in the paper notebook, everything is shareable, and shared in the same way. Either take a picture of the pages, type them in somewhere else (and edit while you do so), or make a photocopy. Optical Character Recognition may be possible but would arguably be adding unnecessary complexity.<p>Expandability - either purchase more notebooks, or use the 3-Ring Binder (tm) model to expand the capacity of your existing device.<p>Community - the paper notebook is no wonder device. The spiral notebook was patented in 1935 and has a large community of nearly all of western civilization.