My NA lists are in the notebook. Actions get their own page, and once I've filled a page, I continue the lists on the next blank page in the book. To help me find things, pages with incomplete actions are marked with a green post-it flag.
The result is that my actions are spread among several pages of the book, but I know that an action page contains actions only, not reference or unprocessed info. The benefit of keeping the list pages in chronological order with everything else in the book, however, allows me to see which actions are stale, what was going on when I decided add an action to the list, and how my projects have changed since that time.
However, with the introduction of the 18-month Moleskine planners (week on one side, notes on the other), I'm considering moving my system to one of these. Actions would go on the page facing the calendar, date-sensitive info would go on the calendar itself, and projects/someday lists would go on the 12 or so pages in the rear. I'd need to carry a separate notebook for my inbox and reference, but there might be a benefit to keeping my actions and calendar together.