I have to say and this my personal view, with the importance of the Internet, email and travel website that are for specific destinations like this one, MadridMan, I find travel books are no longer not important to me.
The only thing I need is a map of the desintation and my PDA/Phone to carry all the information I reseached before my trip.
While not related to Spain, last years trip to Buenos Aires, I did buy two travel books on Buenos Aires and Argentina a year before I was to go. It gave me ideas what to see and do Argentina.
But when it was a few months closer to the day I was to fly to BA, the recommendations where to eat, where to sleep, what see and do, came from those who actually visited or live in Buenos Aires. I did take one Buenos Aires travel book with me but it was hardly used. If I had a question there were Portones at the place I was staying at to help me or I would posted my question on the Buenos Aires forum and few hours later had an answer.
No travel book can give me the up to date information from someone who actually lives in the place I am about to visit.
My second trip to Buenos Aires which is in late October of this year, I have not touch any of my guidebooks. I have plenty of information and recommendations from people who I meet on my first trip or had the chance to know over the internet.
The upside of this using a travel forum as a resource and getting to know people and the chance to meet them in person. It some small way it is exciting to put faces on those forum names who help me planned my BA trip.
While I have not had a chance to do Lunch with MadridMan, I know my next trip to Madrid, hopefully I will able to do it.
No guidebook on Spain, recommends a lunch with MM and that has to be from what I read here, a highlight for those who visit Spain.
Bill