Panel Plugins
From CBLFS
Introduction to Panel Plugins
Xfce Panel Plugins work the same way as the plugins provided by the Xfce-Panel. The plugins allow more functionality from the panels. There are plugins for everything from enhanced versions of the stock launchers, media player controls, local (or remote) weather conditions, and many, many more. Panel plugins cna be found at the Xfce-Goodies project website.