It may not be well known that we maintain extensive package-level Javadocs in our code. Whereas the overview document is meant to provide a general overview of the features in Juneau, the package-level docs are intended to provide in-depth information.
To help make these docs more visible, I've added "Additional Information" sections to the overview document that mirror the TOCs of the package-level docs.
Here's an example:
Caveat - Some of these package-level docs need some cleanup. Also, some of the detailed information currently in the overview document can probably be moved into the package-level docs now that the subtopics are more visible.