Thanks, Francesc, and good question about how to name the pages. For now I created pages by lead author's last name. I figure the chapter numbers will change, and so might the titles, so the only thing certain is that our names won't change :-) (Well, unless you decide to switch the lead author role with someone else.)
Wikispaces allows for page name changes so I can make any adjustments we need to make. Later I'll change the page names to chapter1, 2 etc when we know the order.
Also, everyone should feel free to edit/add new topics to the table of contents, assign yourself as lead author, and add new pages as needed.
I hope my page naming and organizing logic works for everyone!