I've been enjoying using the campaign notebook. As I have a group that contains three DM's, this helps a ton with keeping everything straight between the 4 games running right now!

Being able to fill in the forms in PDF and then print off the pages to keep on hand is invaluable. I am definitely old-school paper, but am also so disorganized that having a digital backup is a lifesaver for both me and my DMs!. It also allows me to keep different people (both PC and NPC) straight, organize areas better so I can look up references, and brings the world to life much better than having a spiral notebook of scattered notes and references.