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I'm a bit skeptical about Kanban boards because you cannot have them with you all the time. That goes against the main idea of GTD to reduce cognitive load as much as possible.

I used to use the "Action Day Planner" together with a notebook for more detailed project-related data, and this system was very capable of organizing my work. I don't think electronic devices and software are very helpful. You either don't have them at hand all the time anywhere, or you end up fiddling with software on mobile phones that distracts and makes you enter text much less efficiently than writing on paper.

Anyway, I found with time that the GTD method is mostly suitable for non-creative, boring management tasks. It's good for delegating and managing under load. Or, as a friend of mine once said: It's more of a "you (pointing at employee) better get things done!" method. I now only use a calendar and "Leuchtturm 1917" notebooks. Any other notebook will do, too, as long as they have a ToC and numbered pages.

[wpietri]

Why can't you have a Kanban board with you?

I use KanbanFlow with both work and personal boards and it's great. The mobile interface fine. For home/desk situations, I'll use a spare monitor or a cheap tablet so it's more present.

Nothing wrong with preferring a notebook, of course; it is easier for some things, and I use to carry one religiously. But since it's an extra physical object I have to haul around everywhere and that requires a special tool to even use, I don't miss it.