I am happy to announce that the fifth edition of the The Unofficial LEGO Color Guide is now available. The book is available as a paperback and hardcover from Amazon.com. An eBook (PDF) is available from Lulu.
An important update happened behind the scenes. In the past I exported the color database to Adobe InDesign and then create the catalog from there. This process was complicated, labour intensive and error prone. The database has now been changed to create the catalog pages directly. Unfortunately, not all the design tricks possible with InDesign can be replicated with the database. The visual design was therefore modernised and extended.