John Quiggin offers some time management tips over at CrookedTimber.org. I’ll second his call for a daily "word quota", but express horror at his notion that you should ever devote a morning to "8-10 jobs that ought to take 5 minutes each."
Here are my suggestions:
1. There is always time to do more, most people, even the productive, have a day that is at least forty percent slack.
2. Do the most important things first in the day and don’t let anybody stop you. Estimate "most important" using a zero discount rate. Don’t make exceptions. The hours from 7 to 12 are your time to build for the future before the world descends on you.
3. Some tasks (drawing up outlines?) expand or contract to fill the time you give them. Shove all these into times when you are pressed to do something else very soon.
4. Each day stop writing just a bit before you have said everything you want to. Better to approach your next writing day "hungry" than to feel "written out." Your biggest enemy is a day spent not writing, not a day spent writing too little.
5. Blogging builds up good work habits; the deadline is always "now."