I received numerous questions about using the authentication plugin. The top question was: "does it work in Joomla 1.0?". I'm afraid it doesn't and it probably never will. If your keen on knowing how to use the plugin and don't know where to start: please watch this video (and ignore the wobbly english).
This is a demonstration of the Joomla authentication plugin I wrote. It allows you to grant SugarCRM contacts automatic access to Joomla.