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Lodewijk at How to Be an Original has the authoritative review of pen-and-paper planner systems.

Check it out:

Requirements for a paper based planner

Before starting to look at the different options, I made a small list of requirements for my new planner.

• Must fit in my pocket anytime
  So it must have a small size (about A6-size) and it must be thin.
• Week in one overview
  I don’t have a lot of appointments, so I don’t need a lot of space for them. Preferably there’s also no timescale to the day, let me decide myself upon my working schedules please.
• Ample space for notes
  I do have a lot of thoughts and things to do, so I need a lot of space for them.
• Simple and no clutter
  I don’t need inspirational quotes, pictures and other clutter. I need a simple system as one of the ZTD habits prescribes.
• Not expensive
  I prefer not to spend a lot of money on it. The PDA was expensive, but it had navigation on it too

So the best solution is small, simple and cheap.

Read the whole thing!