I have decided the year i quit day job is 2013, not after reading this article, but i have been planning it for the past 2 years.
2 years might seem like a lot of time but i started from absolute 0. Now i have few mobile apps in market through which i earn 50% of my sal every month.
Making lists really helps, but even if you loose the list your passion will find a way to get you back to the list.
Keeping this as wallpaper helps too http://d24w6bsrhbeh9d.cloudfront.net/photo/5536250_700b.jpg
Edit: And the only reason i want to quit is freedom