Andreas Ronge has released Neo4j.rb 0.0.5, a JRuby-based graph database framework built on top of the neo4j Java library. The new version now runs on JRuby 1.1.5, features improved Lucene support, and includes additional example code. For those interested in learning more about graph databases, O'Reilly offers a free ebook that explores how to use graph technologies for application development.