I don't even want to think about how many rainforests I've killed in the last month.
edited to add
Although I have to confess that OneNote does do a fairly good job with letting me store and mark up images from my digital camera that are photographs of documents. The visual results are still somewhat surrealistic- a paper document marked up with digital pens, which really do look like they were written straight on the original paper, except for a few little perspective issues...