I'm posting these two pictures as a response to Plannerisms question as to how to more easily incorporate journaling with her planner set-up. She uses a pocket-sized Moleskin PO1D (tell me, is it more 'proper' to say "page on one day [PO1D]" or "one day per page [1DPP]"? Really, tell me!), so this personal-sized Filofax is a different animal, but they can both benefit from the addition of a moleskine cahier.
With my set-up, I slip the front cover of a pocket-sized cahier into the diagonal slit pocket located inside the front cover of my Amazona. It stays in place quite well. It also fits completely inside the pocket, but when I kept it like that I didn't use it as often. It's easy to just pull it out of the pocket, too, and take it with me into a coffee shop, leaving my Amazona in the car. Sometimes it's hard to write when my planner - with all of its tasks - is too nearby.
I use one of those little magnetized, super-light-weight, bookmarks as a page locator.
RE: writing implements...
That's a Frixion pen on the right, in pink. LOVE Frixions. They allow me to write in color on my planning pages without bleed through and without permanency. In case you are not familiar with them, they are ERASABLE. They use a special, hard, rounded tip at the top of the pen to erase marks with friction - thus the name. I have found, though, that I have to store them eraser-side UP in my pen cups in order to avoid dirtying the erasers. You CAN clean off the erasers, but if you don't realize that they are dirty and you go to use them - bleh.
On the left, I have a Caran D'Arche pencil. LOVE IT. It's the only mechanical pencil I've ever been fond of, and I've tried a LOT. I've tried SO many sold at your standard big-box office supply store and was always frustrated with them, but I finally ponied up the cash ($20) and took the plunge on a state-of-the-art pencil. And it actually works. Very little breakage (that's typically been my big problem). It also feels great in the hand (a faceted barrel) and slips easily into my FF pen loops because it is so slim.