phpfox_staffblock

This module will show users on a block that depending for a usergroup. even you can show users information on this block, and easily you can disable blocks from the admin panel as you wish.
Show users in a block
You can select which user groups are displayed.
You can set Limit for groups. (I already did for you but you can change it.)
You can Enable the auto resize mode and it will resize AVIs when users are more than X users. (I already did and the default Limit is 4, but you can easily change it.)
Welcome Member message, but your message based on the time. (Example: Good morning, Good night and ...)
Beautiful announcement message.
Show User's PC Information on this block. (OS, Browser, and ...)
Show Users account information. (username, email and ...)
and more ....