I've used an app called Self Control from time to time, and it works really well. It basically shuts off the internet for a period of time you designate. You create a black list of sites which you can't use, or a white list of sites you can use. It's impossible to turn the app off, even if you restart the computer it's still running! You can run but you can't hide, so you might as well write!

http://workawesome.com/productivity/pomodoro/ This article is what got me interested in the Pomodoro Technique. I've tried to apply it to screenwriting but with mixed results. I find it doesn't work if I'm researching, plotting or otherwise engaged in an activity that requires you to connect stuff together. That alarm tends to freak your groove. But it works like a charm if you're done outlining and you're writing an article, pages etc.

[...] Scott Myer breaks down the simple truth… now please share this article on Facebook and Twitter Seems simple enough, right? At some point, you have to plant your ass in a chair and write the damn ... [...]