I like idea of the designer stationery for the iliad.
I was also thinking about the tabs idea and started working on this in November but never completed it. I was working on a way to add tabs to the right hand side of a pdf, the tabs being specified in a file. The most obvious use would be an indexed address book, but I was also thinking of things like book sections or chapters. I was doing this using latex and created the indexed notepad using latex as well (I didn't fancy doing the hyperlinks by hand).
Once I get the script to create custom indexed notepads written it would be pretty easy to do a whole range of things. I was thinking of including a calendar, diary pages, info pages etc. There are PDFs from the diy planner
that could be interesting as well. We could essentially create a PDF filofax or timesystem.
I need to make some time to work on this script.