I like the thought of picking up a big old book, flicking through the pages and arriving on the particular article I want to brush up on or learn more about.

But! The incremental update when worthy thing could be done... maybe... by an actual book in the game, if that's possible? To add things to it, you simply do the story part, side quest, instance, leve, etc etc, and as an extra cherry, kill mob and get the bestiary entry for it... but like I said, probably not going to happen or possible to do, maybe.