Interesting topic. I've been contemplating getting a planner. Bonnie Hunter has one that she has started using. She has them for sale on her website. Haven't heard how they work or if folks like them.
Seems like I have good intentions for planners and the like with other things but, they fall into cracks of life and I don't follow thru. That's something I'd like to learn...the follow thru and discipline needed to record all the stuff.
Good luck on using one and keep us informed of how it's working for you.