[Zope] developer docs

[Milos Prudek]

What are the best documents for creating Zope products?

I know Zope Book very well and I write TTW scripts. I need to convert a 
bunch of ZClasses into Products.

ZDG seems very outdated. Should I start with mxmEasyProduct and then 
read ZDG? Is there a book available in bookshops that is better than ZDG 
and contains all required information for building products?

-- 
Milos Prudek