Have you noticed that when you start to implement GTD you quickly become aware of what your weaknesses are in terms of self-management?
Mine is the doing. I'm happy to plow through the inbox and make the front end decisions and get everything nice and tidy - even plan some projects, etc., but then its "ok, now what?" I know David Allen recommends the energy priority and time considerations when deciding on what to do, but I havent been successful at getting that done. I still tend to flounder, but now in a much more organized way!
How about you? Anybody out there slain this dragon?