They are very different tools, apples and oranges. Plone is built for content management needs and TurboGears is built for general application development purposes.
Both can work behind Apache but are not based on Apache. They use their own servers. Plone gives you a lot out of the box, but building Plone products, for your custom needs, has a steep learning curve to it. TurboGears is fairly simple to use and a good dev will probably take a day or so to get the hang of it. On the other hand, it will take as much time to learn to use Plone as an admin, let alone develop with it. There are several case studies for Plone on the web. Just Google for them. TurboGears won't have any since it is not officially production software yet. Personally, I don't take software case studies seriously. They are often too contextual, context that does not get adequately communicated in the document all too often. I would choose Plone to manage documents in the Intranet but stick to TurboGears (or some other framework - there are several good ones) for app development. -- http://mail.python.org/mailman/listinfo/python-list
