Display a Bamboo Agent status. It can show if it is Offline, Idle or Busy building.
To use this widget, copy bamboo_agent.html, bamboo_agent.coffee, and bamboo_agent.scss into the /widgets/bamboo_agent directory. Put the bamboo_agent.rb file in your /jobs folder.
You'll also need a nice little icon for the widget. Use whatever you want, name it bamboo-status.png and put it in your /assets/images folder.