Where I have ticked "wax tablets", it's actually because I use KeyNote (http://www.tranglos.com/free/keynote.html), a nifty little program that has a text editor the equivalent of WordPad, but also tabbed and tree'd note storage system. So I keep all of my Narnia fic in one file, with tabs for my two big series, and a tab for standalone fic, within which there are trees for particular characters.