From Lifehack's 50 tricks to get things done faster, better, and more easily.
50-30-20: Spend 50% of your working day on tasks that advance your long-term, life goals, spend 30% on tasks that advance your middle-term (2-years or so) goals, and the remaining 20% on things that affect only the next 90 days or so.
Timer: Tell yourself you will work on a project or task, and only that project or task, for a set amount of time. Set a timer (use a kitchen timer, or use a countdown timer on your computer), and plug away at your work. When the timer goes off, you’re done — move on to the next project or task.
Do Your Worst: Give yourself permission to suck. Relieve the pressure of needing to achieve perfection in every task on the first run. Promise yourself you’ll go back and fix any problems later, but for now, just run wild.