You say you want to write a book. Then you need to be accountable. Here's something to help you. Set up a graph to chart your word count. You can post it on your blog and be accountable to the world.
Get your word count meter at StoryToolz. Sign up is free at this site that's dedicated to "providing high-quality web-tools for authors."
They have tools other than ;progress meters so check them out.
Good tools help writers become good writers.