Just Don't Do It
One of the great productivity tips I ever internalized was the art of not doing something.
Too often, we're so preoccupied with can we do it, and how we'll do it; we don't stop to assert should we do it.
We live in a world of endless need—never-ending work. You cannot produce enough output to fill the bottomless pit of Work To Be Done™. You can, however, simply choose to not do some of that work.
Indeed, deciding to cut out work is one of the most effective ways to get the right things done. Whether you use the Eisenhower Matrix, or wing it—you should dump unimportant work as often as you can.
Whether you're building a website, shipping a powerpoint, or writing an email, start with questioning, "Does this need to be done now? What are the ramifications of waiting or simply not doing it?"
Much to Nike's chagrin, you'd be surprised how often the right answer is to Just Not Do It™.