Yes, I do in fact use GTD for keeping track of my TODO list and calendar. The part of GTD that I had trouble with, though, was the paper organizing part. I could never manage to keep all my papers properly filed as they came in, nor could I manage to work my way down to a clean desk as Allen recommends. That's where Pomodoro really helped me. 25 minutes at a time, once a day, is enough to keep the stack under control.