Barker proposes the following:
"1. Get your to-do's out of your head and onto one document.
2. Lock in your calendar and set alarms so you don't need to think about what's next.
3. Use "batching" and filters so you only get the info you need when you need it.
4. Opt for "good enough" on the little decisions so you can focus on the big ones.
5. Regularly capture, triage and prioritize new items.
6. Have a "War Room" that contains what you need - and nothing else."
I am a huge fan of using what I call a "parking lot" (a piece of paper or notebook) to park all those 'to-do's', 'what if's', and 'how abouts'. It is a terrific way to get floating thoughts out of your head and put them somewhere meaningful (where you know you have committed a chunk of time later in the day or week or address those items).
The best part about the parking lot? Striking off that item when it is dealt with (this allows me to not only be productive but feel productive).
What works for you?