I was very excited to skim through the rich, meaty goodness that is Martin, Hanno and Whit's new Plone Developer Reference.  In one handy document, they cover a wide range of topics of interest relevant to folks who are looking to develop new add-on Product for Plone or to contribute to the Plone core codebase.

It represents a massive updating of the basic how-to documentation for Plone developers and distills much of the wisdom the Plone community has gained over the past few years of very active development and big changes to the codebase.

The new reference outlines the general principles and processes of Plone development and releases -- which have become quite mature now that Plone is stewarded by a rather large team of developers.  There's a nice high-level discussion of the emerging role of Zope 3 technologies in Plone.  Some sensible advice about development best practices.  Insight into migrations and upgrades.  And some very welcome information about building navigation structures and content types. 

Much of the content specifically addresses the new internals of the forthcoming Plone 2.5 release.  It's especially great to have such detailed information available before the release.

 Very, very impressive work, and a solid platform upon which others can build.   Big thanks to Martin, Hanno and Whit.