I just installed some updates with PackageKit in F15, and got the 'A restart is required' notification. This is currently a child dialog of the PackageKit window. When the notification popped up, *only* it was popped to the front - the PackageKit window remained hidden behind other apps. So the 'Restart is required' child window looked a bit odd, shorn from the context of its parent window. Is it supposed to work like this, or should the parent window also have been popped to the front?
(For true polish, I think it'd be nice if the 'restart is required' dialog were a Shell-y thing like the new PolicyKit authentication dialogs, but that's really just a side note).
Also, the dialog and PackageKit itself seemed to just disappear after about 30 seconds or so, I don't have a crash report from abrt so I'm not sure what happened to it.