I am currently geeking out about this:
It’s called the Circa Notebook System, by Levenger. It’s basically best described as an intensely customizable notebook/binder/organizer. The design of the binding allows pages to be easily removed and replaced however necessary, without popping open binder rings or tearing pages. Dividers, a million different types of filler paper, and tons of other options are available in order to customize your notebook just as you need it, and you can buy a Circa hole punch so that anything can fit securely inside.
The idea of super-flexible, modular, and simple notebook/binder-type organization really appeals to me.