Just to point out that I have just published a book written 50% with a friend of mine, Roberto Gonzalez, from Renacimiento (he is MVP in Biztalk).

César de la Torre (Architect Evangelist – Microsoft)
Roberto González (MVP Biztalk)

Editorial Krasis Press
ISBN: 978-84-935489-7-1

Take into account it is written in Spanish, as there are not so many technical books written in Spanish. You can take a look here:

http://shop.campusmvp.com/Product-Arquitectura-SOA-con-tecnolog%C3%ADa-Microsoft_65.aspx