Caps lock indicator in Linux / Gnome2

If we want to add a caps lock indicator in the Gnome2 panel (that one that shows the clock) there is one easy alternative. We can install the package lock-keys-applet.

$ sudo apt-get install lock-keys-applet
$ killall gnome-panel

Once we have done this, we can add to the panel the new element doing right click in the panel, "Add to panel" and then choose the "Lock Keys" applet.

Source
http://ubuntuforums.org/showthread.php?t=1224918