When The Definitive Guide to Plone e first arrived on bookshelves in 2004, Plone 2. 0 had just been released and had little notable open source competition. The first edition of The Defi- tive Guide e provided a truly comprehensive overview of the features of this early version of Plone and brought many new users to Plone. It was a major landmark for Plone and for open source content management systems (CMSs) in general. In the intervening years, the open source CMS universe has expanded rapidly. There are now dozens of competing open source CMSs, from humble blogging platforms to flexible...