We've checked out some great paper notebooks before, but new options are always welcome. Sorta is a new notebook/binder with removable, rearrangeable, customisable pages.
The paper is always removable and swappable, so you can put grid paper in for diagramming and lined paper in for taking notes in a talk or meeting. You can even combine them, so it's like carrying multiple notebooks in one. The Sorta is rather like a combination of a binder and a traditional notebook, matching the flexibility of the former with the portability of the latter. Hit the link below to check it out.