any documentation, if included in the package at all, is removed after the installation process.

the used to be a standardized help framework in Maemo<5, but that was removed to enhance the user experience in Fremantle IIRC.

I do agree that sometimes it's difficult to figure out what to do after you downloaded certain applications form Extras. Some don't even show up in the applications menu, so the user wouldn't have a clue on how to start them.