I am in sales and I read David Allen's book a year ago. I implemented some of the ideas, but fell way short of putting the system to work for me. For me the downward spiral was due to the amount of calls, emails and paper documents I need to shuffle everyday. I had no way to categorize items quickly enough because I had no ACW (After Call Work) time to organize what I had just done.
This is all compounded by the fact that I have Sleep Apnea , which means I do not get good sleep at night, but can't wake up in the morning. I work non-stop at work at my desk, but at home or on the road I get no work done. I basically have emotional highs every Friday (because of no work and being able to sleep in) and emotional lows on Sunday evenings.
The David Allen newsletters have kept my hopes up that I can refocus and implement the GTD system.
I read an interview with Gene Simmons of KISS in the Southwest Airlines inflight magazine and in affect he said 'I work 24/7/365, but I have no job'. That's where I want to be. Sulli60