I started my computer, a notification showed up telling me that there are updated packages etc, etc. I clicked the tray icon, not the notification, after couple of seconds Update Manager window appeared but the notification was still there for about half a minute. I'd expect it to go away the moment I click the tray icon or at least when Update Manager appears.

Hardy Heron
notification-daemon 0.3.7-ubuntu10
update-manager 1:0.87.10
update-notifier 1:0.87.10