Hi Folks. I'm a huge fan of David Allen's ideas, and I love to hear seasoned practitioner's implementation tips around adopting GTD. I wanted to ask you (the smartest bunch of users - yes, flattery!) which you've found most helpful - the ones that weren't obvious from reading the book. We've seen a number of them here, including sub-projects, too many NAs, procrastination, etc. How about it? What was your favorite "aha," insight, or question that most dogged you before you made the system click? Or did you pretty much get it all from the book?