Sections

Links

Links section.

General

Plone course by Upfront Systems: The course covers general working with plone, customization and developing own types. It's under the Creative Commons Attribution-NonCommercial License.
Introduction to Plone: Complete set of articles introducing new users to Plone, from the registration onwards.
Plone: A model of a mature open source project: Martin Aspeli's excellent MSc dissertation for Analysis, Design and Management of Information Systems course at the London School of Economics.
The Zope Book (2.7 Edition): The Zope Book (2.7 Edition)
Scaling Python for High-Load Web Sites: PyCon 2007 presentation. Not Zope specific.
Buildout documentation: Developer documentation for buildout, the Zope package Plone uses to build and manage deployment configurations.
Workflow's Hidden Gems: A high-level overview of DCWorkflow by Martin Aspeli, with lots of tips, tricks and often-overlooked features of one of Plone's most powerful and useful systems.

W3Schools Tutorials: An excellent free resource for XHTML and CSS tutorials. Highly recommended.

How to Think Like a Computer Scientist: How to Think Like a Computer Scientist Learning with Python
ZODB - Frontpage: The ZODB is a persistence system for Python objects. Persistent programming languages provide facilities that automatically write objects to disk and read them in again when they're required by a running program. By installing the ZODB, you add such facilities to Python. By default your content in Zope is stored in the ZODB.
Standard Python Library (Redux): Based in part on over 3,000 newsgroup articles written by Python veteran Fredrik Lundh since 1995, this book provides brief descriptions and sample scripts for all standard modules in the Python 2.0 library.
Wing IDE: Whether you're building a dynamic web site, desktop application, or complex enterprise solution, Wing IDE and Python give you a fast, scalable, and portable platform that lets you concentrate on building your application-specific functionality. Wing IDE allows you to remotely debug Zope/CMF/Plone applications.
Pyrex: Pyrex is a language specially designed for writing Python extension modules. It's designed to bridge the gap between the nice, high-level, easy-to-use world of Python and the messy, low-level world of C.

A Comprehensive Guide to Zope Component Architecture: Zope Component Architecture (ZCA) is a Python framework for supporting component based design and programming. It is very well suited to developing large Python software systems. The ZCA is not specific to the Zope web application server: it can be used for developing any Python application.

Russian: Plone Book: Translations of Plone Book to russian. Перевод Plone Book на русском.
Brazilian translations: Brazilian translations of the Zope and Plone documentation.
Lithuanian site dedicated to Plone: Simple yet constantly evolving site dedicated to Plone CMS, written in Lithuanian. Targeted both at end users (content creators) and developers (site administrators).
German: Developing Plone products: Tutorial basing on the PloneProductFramework, for german speaking people.
German: Plone Development Book: Documentation of a real-life example for a plone development process.
Spanish end user manual for Plone 3: An end user manual on web and installable in Plone 3 based on existing english manuals