Thanks to Carlos and Jens we have the ZODB book being updated
daily on zodb.org, http://www.zodb.org/zodbbook/ -- also have
disqus integrated into sphinx html output. People can read the
first three chapters and provide feedback at the bottom of each page.
We are looking for feedback. If anyone is interested in contributing;
maybe starting a recipe-style section for the book. We can get you
account and you can start contributing on github (svn is supported).
For more information about ZODB, see the ZODB Wiki:
ZODB-Dev mailing list - ZODB-Dev@zope.org