Using a computerised system to manage your to-do list often makes more sense than using paper-based organisers. You can keep things much more neatly, rather than crossing out stuff when it's been done. And you can back up the data for safety and security. And if you have the right sort of portable device, such as an Android smartphone or an Apple iPod/iPad, you can access your information from anywhere.
If you haven't tried organising your life online yet, and you want to give it a try, Wunderlist is a relative newcomer to the market and their system is very easy to use. It's free too. Just go to www.wunderlist.com and sign up, either by creating a new username/password or with your Facebook account credentials.
You can then manage your to-do list very quickly and easily from any machine that has web access. Plus, there are separate client apps for Android and iOS, to keep everything in sync.