System
System plugins operate every time a page on your site loads. They control such things as your URLS, whether users can check a "remember me" box on the login module, and whether caching is enabled.  New in 1.6 is the redirect plugin that with the redirect component assist you in managing changes in URLs.
Default on:
- Remember me Help
- SEF Help
- Debug Help
Default off:
- Cache Help
- Log Help
- Redirect Help
User
Default on:
- Joomla Help
Default off:
Two new plugins are available in 1.6 but are disabled by default.
- Contact Creator Help
Creates a new linked contact record for each new user created. - Profile Help
This example profile plugin allows you to insert additional fields into user registration and profile display. This is intended as an example of the types of extensions to the profile you might want to create.
Articles Category Module
This module allows you to display the articles in a specific category. Help
Related Items Module
This Module displays other Articles that are related to the one currently being viewed. These relations are established by the Meta Keywords.  All the keywords of the current Article are searched against all the keywords of all other published articles. Help
Content
Content plugins run when specific kinds of pages are loaded. They do things ranging from protecting email addresses from harvesters to creating page breaks.
Default on:
- Email Cloaking Help
- Load Module Help
- Page Break Help
- Page Navigation Help
- Rating Help
Default off:
- Code Highlighting (Geshi) Help
Latest Articles Module
This Module shows a list of the most recently published and current Articles. Some that are shown may have expired even though they are the most recent. Help
Login Module
This module displays a username and password login form. It also displays a link to retrieve a forgotten password. If user registration is enabled (in the Global Configuration settings), another link will be shown to enable self-registration for users. Help
Archive Module
This module shows a list of the calendar months containing archived articles. After you have changed the status of an article to archived, this list will be automatically generated. Help
Most Read Content
This Module shows a list of the currently published Articles which have the highest number of page views. Help
Who's Online
The Who's Online Module displays the number of Anonymous Users (e.g. Guests) and Registered Users (ones logged in) that are currently accessing the Web site. Help