I must admit that the author's method is quite interesting and effective. To say that it is simply based on lists is a huge understatement. David Allen proposes a process to deal with everyday's activities in which for every task that must be faced a "next action" is defined. Lists and calendars serve for keeping the mind free, instead of trying to maintain schedules, appointments, deadlines, notes and things to do all in one's memory.
Most of the advices proposed in Getting things done are purely based on common sense, but they are strangely often forgotten or dismissed, especially in work environments.
I've learnt some interesting few tricks from this book. Three are worth mentioning here, that is: the 2 minutes rule (if you need less than 2 minutes to do something don't defer it and do it now), the importance of always identifying a next action for each task and defining in meetings a clear purpose at the beginning and a list of actions (and responsibilities) at the end.
The book has been initially published in 2001 and there isn't much emphasis on the exploitation of technology (besides some random mentions of PDAs - that was way before smartphones! - and personal productivity features of desktop softwares like Outlook or Lotus Notes). This should not be considered detrimental of the book: its value is in the process, not in the suggested (low tech) implementation.
Despite these good things there are also some annoying facts about Getting things done. To start with, its messianic style, the constantly repeated mantra that your life can deeply change if you follow the advices of this book. Moreover while the method can really apply to everyone (and, to say the truth, this is often repeated throughout the pages) the examples in Getting things done refer always to a vip audience. All this gives the impression that David Allen is constantly promoting his activity as a consultant: this is legit of course, but it is sincerely annoying to get this feeling in a book you've bought.
Finally, despite the book is not very long, often concepts are repeated over and over again. You could actually get the same value from it even if it had 40% less pages.
Despite these flaws I deeply suggest the reading of Getting things done to those who feel in trouble to keep the pace of business and personal events. I honestly learnt some useful strategies here, which at the end is the only thing that matters in a book like this.
Getting things done - The art of stress-free productivity, David Allen, Penguin Books 2001