Here’s a bunch of people talking about how many notebooks they are using at once:
How many notebooks do you have going right now?
I found the page via a search that resulted in this image, though the image doesn’t appear on that page. I love all these piles of notebooks, all labeled and dated and lined up by type!
See the original image here: Google Image Result for http://taguealibrary.files.wordpress.com/2012/06/rd-note.jpg.