Aspeli Martin 
Professional Plone Development [EPUB ebook] 
Building robust, content-centric web applications with Plone 3, an open source Content Management System.

Plone is an open-source content management framework, built on the top of the Zope application server and written in Python. As a ready-to-use Content Management System with a focus on usability, Plone makes it easy for content authors to create and edit web content. Plone is also used by developers, as a framework for building content-centric web applications such as dynamic websites and intranets. This book focuses primarily on the developer-oriented aspect of Plone.