Break up big tasks into smaller ones. For example, let's say you have to write a massive memo. The object of this game is to cross off all the boxes you can. Everything Has a Home. At the end of the day, everything on your desk goes home.
Clutter distracts most people and makes it too easy to lose things, which wastes time.
Make liberal use of the recycling bin. The minute you can get rid of unnecessary paper, throw it out to reduce clutter and decrease distraction. Write out your plan for the day on 5x7 note cards. On one side of the card list the work promises you make to yourself for the day. Use a thick black magic marker to obliterate everything you finish.