A few things that really help me get more done:

1. Pomodoro technique: Set a timer for 25 minutes, work on a last without any interruption. Then take a break for 5-10 mins, rinse and repeat. It's so much easier to start when you only are working for 25 minutes at a time.

2. Do the biggest task first: It's best to do the biggest task first, rather than smal tasks like checking email etc. This is because that's when you're most fresh and energized. After you have completed that task, you'll have such a strong feeling of accomplishment and that will carry through to the rest of your day.