How can I stay focus and stay off of non productive websites like social networking, blogs, etc?

Yes, I don't go on unless my work is done. If I do go on before my work is done, I set a time limit. The punishment for me is that the work must get done and people just keep adding more things to do at unpredictable times, which forces me to get things done. Now this is my last post until I finish my work. So long!