I just came across this article at "The Art of Manliness" site and thought you guys might find it interesting to see who used pocket notebooks and how they were used.
http://www.artofmanliness.com/2010/09/13/the-pocket-notebooks-of-20-famous-men/
http://www.artofmanliness.com/2010/09/13/the-pocket-notebooks-of-20-famous-men/