Is Getting Things Done helpful in terms of understanding PM, and does it make any direct contributions?
I'm not asking whether GTD will make you better organized, or more effective generally. I mean, has it led to practical tools for PM?
I'm a great fan of GTD, and I believe in custom-fitting to take what benefits you. Things I found from GTD that are great when applied to project management:
Other than that, GTD doesn't really add much to project management. You'll get more out of PMI's framework, or a specific methodology like Agile.
One element of GTD that has been helpful for me in project management is the habit of asking "What is the next action?" when a particular issue, problem, or mini-project is discussed in a meeting. All too often, meeting participants can leave the room without the "next action" being identified. Thinking in terms of GTD for my personal productivity has led me to ask this question more often.