Using the number of sessions this block will display a short message showing how many users are currently active on your site. It has a built in style guide which can be disabled and the message it displays is configurable.
--- Changes 1.1 ----
The Registered user functionality has been disabled in the core code. The process used to determine a registered user relied upon some php file based functions and some service providers have these disabled.
I am working on re-implementing this feature in another manner.
--- Changes 2.0 ---
This one has been implemented using a database and a Concrete5 event. You must enable application events for this extension to work.
--- Changes 2.1 ---
Fix the show stopper issue when upgrading this component.
--- Changes 2.2 ---
Fix upgrade error message.