I used your categories; however, I used them as tags, not notebooks. I have only two notebooks, one for Inbox and one for everything else. I empty the Inbox notebook every day, assigning tag(s) to each note. I desire to break away from the "paper-folder system" mentality that I've used. I've have not reach a satisfactory result with the "paper-folder" system.. i'm thinking tags will give much more powerful and flexible system that works better with my thinking, body and tasks. Using the suggested categories as notebooks seems like reverting to the physical "paper-folder" system. The tag approach is a better fit across my three platforms of iPhone, iPad and destop computers. I've had to do some special prefixing of the tags on the desktop so the tags will show up in logical order on my iPhone, allowing me quick access to any tag on my iPhone. The default notebook allows quick entry of any info/ideas during day on my iPhone. One two-hour stretch while feeding and working with the horses, I enter 10 tasks into my iPhone which shows up in my Inbox on my desktop. Then, I process the Inbox on my desktop as it is lot easier to read and enter information. I'm experimenting with tag words in "physical (moving, sitting)" and "energy (hi, low)" as my body requires periodic movement at 68 yrs to function pain free.. The tags allow me to quickly change to another task. I somewhat follow and used ideas from David Ward, Ruud Hein, Bobby Travis, and Daniel Gold articles/entries.