For my writing, I enter a block of time that is specifically dedicated. It might be a two hour time slot for plotting. Or a one hour session on scene tracking. Whatever it is, it becomes an important appointment with myself that I must keep. When I log onto my mac in the morning, and start checking emails and surfing the net, my calendar is running away in the background. When I procrastinate past my allotted time to "play, trapping myself in the sticky wide web, a calendar reminder pops up and lets me know that I have a word count to meet, or a scene to develop etc. It helps me refocus. And it makes me set goals. It is easy to click it away but it is far more rewarding to acknowledge it and get on with what task I have set to improve my writing.
They only take minutes to set up and once they are in, you can drag and drop them from one day to the next when you plan for your next writing session. It's a little like having your conscience online and having to be accountable. Which reminds me...time for bed!
So, how do you keep yourself on track?