I am curious--what challenges have you had to overcome to implement GTD and what did you do to overcome them? Also, what benefits have you accrued as a result of GTD? Any surprises along the way? For me--the sheer volume, boredom with going through stuff and getting fatigued and getting interupted. Listening to the FAST tapes I am working has helped a little. I am challeneged by the number and kinds of context buckets (I'm not always right) about what I can do where. Projects to next actions is a devilish problem. I keep spawning more and more projects as I try to tackle the existing ones (they truly have babies). My weekly reviews which I am now doing several times a week because my hard landscape changes have boosted my productivity. I am putting lots and lots of trash out!