Cellphone Camera as Recorder

It is just this year that I started to carry a cellphone with a camera. I quickly found myself using the camera as an always-available information recording device ... for example taking a picture of a subway map that I would need later. Or taking a picture of some notes we scrawled on a napkin or a whiteboard for sharing. Popsci has a list of other examples, all very simple, even silly, that alerted me to other similar uses.