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krb5-auth-dialog-3.0.0-1.fc15.x86_64 installs a /usr/share/applications/gnome-ka-panel.desktop which tries to launch 'gnome-ka-properties', and is described as "Kerberos Authentication". There is no gnome-ka-properties binary in the krb5-auth-dialog package, or anywhere else I can find. The impact of this is you can find a 'Kerberos Authentication' icon in the Shell overview Applications view, which gives an error message when you click it.
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This bug seems to have been fixed, in that the .desktop file in question refers to an actually-existing binary in F17.