An alternate thought -- I just picked up a plastic, expandable, multi-pocket file folder with from Target. Three ways you could work this:
1. Keep your actions in Outlook tasks, minimize all but the context you want to highlight, and then print out a sheet for each context. Throw them into your NA pocket.
2. Writing by hand, build your action lists on individual pieces of paper. Throw them into your NA pocket.
3. Write your next action and its context on an index card, and just throw it into your NA pocket. (You could increase the visual appeal of this method by color-coding by context.)
The thing I like about the expandable file is that you can basically throw whatever you need to in the appropriate pocket, nothing ever falls out, and you can use it however it's fastest. Thinking of getting on for my tickler items as well.