Ubuntu Unity Launcher: show all devices

By default, the Unity Launcher in Ubuntu Natty shows only devices that have been previously mounted.  Here's how to see them all:

In a shell, type

sudo apt-get install dconf-tools

dconf-editor

Once the editor's launched, navigate to Desktop -> Unity -> Devices and you're able to switch devices-option to either Never (don't show any), Always (show all), and OnlyMounted (the default).  Changes are applied instantaneously.