The following is from a private email from Wayne Grudem to some friends (posted with permission):
"Those of you who have ever seen my home study will probably remember that I’ve always had piles of paper on my desk – things waiting to be done. Now for the last 10 days I have had a completely clean desk for the first time in over 20 years. No piles of papers! And this is in the midst of a lot of demands on my time regarding some publishing deadlines and other responsibilities. How did this happen? It was the result of a remarkable new book by David Allen called Getting Things Done. I had heard of the book from several different sources and read through it about two weeks ago. I began to implement Allen’s remarkable system and all my papers are now either processed (those that take under two minutes Allen says to process immediately) or else put in a file and alphabetized, as well as being listed on a 'project list' that I now carry with me and can look at quickly and see everything at a glance. Allen has a number of other helpful procedures, such as creating a “next actions” list out of the project list, but I won’t try to reveal the whole book to you at once.
"Just let me say that I highly recommend it and it has marvelously increased my peace of mind, clarity of thought, and ability to concentrate on the task at hand as I sit at my desk each day. And I know it’s working because my desk stays clean as new items come in and I process them according to Allen’s system."