Link ExecutiveHacks. 
David Hutchison suggests,

How can you do more in a few hours than most of your colleagues do in a day? Simple. Do only one thing.

It’s not GTD, it’s not Seven Habits … it’s more Nike — Just Do It.  You don’t incorporate a new system, there is no cross-reference of immediacy and importance … really.  Check out David’s strategy, then rather than mulling it over, try it!