Just for your interest, we (KT Studio) announced earlier in the week a
bobo based appengine application/service.
www.qtracker.com.au. Unfortunately you can't see much of it apart
from the banner page, as the application requires
all users to login.
The full stack comprises of
repoze.what (and of course who)
zope.pagetemplate (wrapped up for appengine)
their dependancies and of course our application code.
All bobo routes, appengine models, viewlets registered via
zope.component, and formish schemas are generated directly from UML
The system has been in use for a few months.