For my first twelve (give or take) hours of mucking with Zope 3 to make this snippets app, I've made OK progress. Firefox does not seem to be loading the prototype.js resource, but Safari is loading it fine.
I'm trying to figure out how to get a dynamic 'add form' to render on the page. So far, I have a fresh one loading (Safari only) via Ajax. The tricky bit will be validation and returning the form segment with validation errors inside of it. I may have to extend or replace some of the Zope 3 'adding' components for this purpose. Looking at their source, it might not be *too* bad to have to do, and it will give me a good chance to learn more about the schema and widgets system.