Fedora Core doesn't yet have the KDE front-end for networkmanager 
(knetworkmanager).

Suse and Kubuntu do.

The Fedora wiki says (http://fedoraproject.org/wiki/Tools/NetworkManager)

"Unfortunately, KDE currently lacks the libraries that would be required to 
write a desktop control applet. Specifically, the necessary QT-DBUS bindings 
are not yet ready. QT-DBUS bindings are currently expected to be available as 
part of KDE 4.0."

However, I this information is wrong. Fedora Extras 5 contains dbus-qt version 
0.61. Suse and Kubuntu are providing knetworkmanager using the same version of 
KDE as Fedora has.

[david@shed ~]$ rpm -q dbus-qt
dbus-qt-0.61-4.fc5