I strongly suspect that the reason that many GTD blogs and websites endlessly revisit tooling is that it is a relatively easy topic that automatically, commercially refreshes itself.

The value of GTD in my experience is in the transformation of your thinking. If I do nothing else with GTD, the fact that I never exit a meeting without being utterly, completely clear who is doing what about what is worth a working day every week.

I recently got asked to run a project by a group of people who were well aware that I knew far less about the subject matter than the previous project manager. They specifically requested my assistance because they liked having clarity about what needed to happen. I would love to believe that was down to my fine qualities, but it is mainly because I never let anything flit past without having clarity about the outcome and next action.

I blog about GTD too and the trouble is that there are only so many times that you can say that outcomes and next actions are key and valuable. But that is still the main thing worth saying...