Just do it. Do it now, right when you read this post. It's completely worth it. It's just not worth it to come here and read articles about how to be productive and then not end up doing anything because you're on HN. I did it a few months ago and never looked back.
You know what - I just did it. I know my productivity yesterday was shot - let's see what today brings. Thanks for that little verbal push - I may have actually needed that.
Back to work...