Made the decision to go with Zope, though a lot of the stuff on the heavily trafficked lists is currently flying way over my head. Had a good whine about the docs on the list.
Anyway, this excellent document is the place to start:
Watch out for newbie caveats! They bite:
Some background stuff:
Some platform specific stuff:
The list to ask when you've had enough:
http://lists.zope.org/mailman/listinfo/zope
which you can search using google: