Comment 5 for bug 498683

As far as I know Ayatana notification patch has not been and will not be applied to KDE 4.4 beta packages. If the checkbox is checked you should get Plasma notifications, if it is not checked you should get knotify old-school notifications (grey box with a 2 pixels black border)

About Kopete notifications, this might be related to Kopete itself.

You might want to do more testing with notify-send (from libnotify-bin package), a command line tool to create notifications:

notify-send -i kde Hello "This is a text"

should show a notification with a KDE logo, "Hello" as a title and "This is a text" as a body