The upcoming Alfresco book Professional Alfresco (ISBN 978-0-470-57104-0) is now available for pre-order at Amazon. I look forward to this publication since it is written by Alfresco insiders including CTO John Newton, Chief Architect David Caruana and product managers Mike Farman and Michael Uzquiano. The book will be published by Wrox Press and is expected to be available in May.
Professional Alfresco seems to focus on developing Alfresco extensions using light-weight scripting technologies. This topic is increasingly important for Alfresco developers and only covered to some extend in the other books available about Alfresco. The Alfresco Developing Guide by Jeff Potts focuses more on writing Java customizations and Alfresco 3 Enterprise Content Management Implementation focuses on the out of the box functionalities and configuration options. From the Table of Contents it is difficult to judge if the book covers more advanced topics related to Web Scripts, Surf and Share development.