I'm very happy to see that Alfonso Romero's book on Roller is due out in a couple of days:
Apache Roller 4.0: Beginner's Guide http://www.packtpub.com/apache-roller-4-0-beginners-guide/book I've seen the drafts and I wrote the forward. My review in a nutshell: a nice solid beginners guide with lots of illustrations and detailed step-by-step guides that walk you through installation on Windows and Linux, blog setup, theme customization and blogging. - Dave