today I've released ZedSeries Help System, an extension that let developers creating manuals of their own extensions and distributing them with the extension. It is available in the official repository so can be installed through the Extension Catalog
In other words if you are a developer and are you looking for a way to document your extension I suggest you to give a try at ZedSeriesHelpSystem .
The included "inline" manual is (of course) built with ZedSeries Help System, this way the application itself is a demo of some ways of integrating inline help.
from the description of extension:
(http://www.typolight.org/extension-list ... 09.en.html)
ZedSeries Help System provides a quick and easy way to build and manage an help system for TYPOlight extensions. Create a powerful help system that incorporates context-sensitive help.
The project changelog is managed through bitbucket (http://bitbucket.org/zedseries/zedseries_help_system/)
If you have questions, doubts, feature requests, bug reports etc. please let me know creating a new issue at http://bitbucket.org/zedseries/zedseries_help_system/issues/new/ .