There is a known dysfunction of a keyboard layout switcher in GNOME – a habit of not showing a country flag. It is so much well-known that soon it is going to be even more well-known than GNOME.
It does not take much to fix it in Fedora, just locate a needed flag icon (it should be available in the system) and place it to the correct location.
sudo cp /usr/share/xfce4/xkb/flags/[LANG].png /usr/share/locale/l10n/[LANG]/flag.png
The information above is outdated for Fedora 11.
See the screenshot below on how to switch the flags on.