This book is AMAZING! Such good quality! It has very good English descriptions of the entire route, breaking it up into 42 stages. As we will be on bikes, it will not take us 42 days :-D but the level of information is fantastic. There are descriptions of each town you pass through as well as colour photos and of course, route maps. I managed to buy it online here: http://www.libreriadesnivel.com/libros/the-way-of-st-james-from-valencia-to-santiago-gr-239/9788496715332/
Just be aware that it may not be in stock and that you will need to know Spanish (or someone who does) to organise with them to send it to you once it gets in stock. I only had to wait a week so it was fine. The book itself was not expensive, but the postage to Australia, plus the currency conversion meant it was about $100! expensive, but definitely worth it. Will make for a good souvenir on our return too :-)
Thats all for now! Will post our packing experiences in a few days, and then off we go! Now we just have to cross all our fingers and toes that our health will let us complete this journey that has been two years in the making!!