I agree that the Zope Book, available free online at zope.org, is the best book to start with. But I would say that I found the most value in Zope Bible as my second book. You have to learn to do Python if you're going to take Zope to where it can be and wants to go. The Zope Bible is the only of the books you mentioned that really digs into the Python aspects of Zope. Very informative and quite well done. Building new products in Zope -- which is almost certainly what you want to do even if you don't yet know that clearly -- is best done in Python, not using the Zope ZClasses, which are apparently quite fragile and obstreperous. That certainly has been my experience in any case. Dan Shafer, Chief Scribe and Tablet Keeper PythonCard Open Source Project http://pythoncard.sourceforge.net