Accidentally clicked "don't show this message again" - how to reactivate?
Solution 1:
Not sure if there's a GUI way to do this, but this will work:
gconftool --toggle /apps/nm-applet/suppress-wireless-networks-available
This basically edits the Gnome "registry" to toggle the value that you set when clicking that button.
Solution 2:
Editing the gnome configuration file in your home directory at /home/<your account>/.gconf/apps/nm-applet/%gconf.xml
and change the corresponding lines to false should do the trick:
<?xml version="1.0"?>
<gconf>
...
<entry name="disable-connected-notifications" mtime="<some value>" type="bool" value="false"/>
<entry name="disable-disconnected-notifications" mtime="<some value>" type="bool" value="false"/>;
...
</gconf>