[Zope] quick question

Well, I just read all about ZClasses in the Zope Developers Guide, and it is obviously time that I stop mucking about writing Products entirely in Python, and start using ZClasses. What do people recommend as a good example ZClass Product, preferably one that defines much of the application logic in Python, with the interface being done in the ZClass. Michel, I believe that you recommended this approach quite recently, where should I look? --sam