I created http://goalstacker.com to address this problem. It's not the list that kills you, its the list you can never finish that kills you. In order to be productive each day, its nice to have a small set of obtainable goals that you can actually finish. This list need to take into account how much time you have and how much time it takes to complete these tasks.

I think the author's method is pretty close, the only problem with a calendar is that if you don't finish the task then one of two things usually happen:

1. You forget about it and it fades away never to be completed. 2. You have to keep moving it to a different day until you complete it.