A friend in the writers' group I'm in recommended the site 750words.com. If you want to get cracking on being disciplined and really make the writing habit part of your everyday life, there's nothing like signing yourself up to be on a Wall of Shame. Just kidding.
There are some great tools here to help you keep track of your goals. You also get points and badges and some really interesting features, one of which is like a mood ring based on your writing.
3 pages a day might be how you start getting back into the practice of writing if you've fallen out of it. You can do 3 pages a day. And everyone likes penguin badges, right?
Do you use this site? Any tips or tricks for those who might be interested?