Currently, in the central part of the footer on every page, it gives the edition. This is not really that useful. I would find it helpful, especially in the printed edition, if the footer indicated the current chapter name, or the appendix name. It makes scrolling through the online document (or flipping through the printed one) easier.
Also, I much prefer the common page numbering scheme which has separate page numbers for the appendices rather than the unified one used now. (E.g. page A-1 for first page of appendix A, B-1 for first page of appendix B, etc.) That way, when there is a reference to another page in the text, it is immediately obvious which section of the book you are being referred to, and I find that useful.
Marcel