The book tries to use a consistent example of building a movie based recommendation engine where possible in the various chapters to try and illustrate points, though there is no final application built at the end of it all. The book also comes with access to sample code in the form of JUnit style tests which aims to demonstrate what was learned in the chapter, also accessible from here http://www.manning.com/Neo4jinAction
As a follow-up to the question, I wonder what project would be the reference implementation of the concepts in neo4j. I'd like to have a step-by-step project where just a neo4j newbie like me would be able to see the features in action. Is there such a project available?