A-Z File System for your planner

I have been wanting to do a 3-ring Binder Planner for some time now. I think that type of Planner would be easier, not sure sure if there are other types of "planners/planner systems", but that is the one I would prefer, how about you? It just seems so much easier to keep everything much more organized if you use a 3-ring Binder. 

Can you think of anything that is not on the List that could be put in your Planner? Let me know, leave it down in the comments.