Two good webaddresses not mentioned yet:
http://www.caminolinks.co.uk is very useful. You will find a lot of good links to Via de la Plata. There is also Photo Links to Via de la Plata there.
But when I want to dream of me Camino next spring, I go to a spanish address (although I can only a few spanish words).
http://www.godesalco.com. There are for example good information on places to stay at night, but if you go to "Mapa de la ruta" and "klikk" on the places mentioned, you will find 144 pictures from Sevilla to Finesterre. Those pictures made me want to go Via de la Plata! You can also find what they call a "Planificador" there. You can select the end-points of your camino and at the end of the prosess, you will end up with a "grafe" that you can print, that shows distances, places to stay,height profile and so on. Since I have not been on Via de la Plata yet, this is my "dreaming-on-the web-place". Bjørg