I love productivity books, and try to read one at the start of every year. My take-away from this one is the value of the "two-minute rule": If you find out or decide something needs to be done and you can do it in 2 minutes, do it right now. If it takes longer to set up a note to remind yourself to do it than just to do it, ditto.
I also like the idea of dumping all the nagging to-do's into a file or list or file folder so they're off your mind but still accounted for. So far, a week into the experiment, it seems to be working.