When you install JoliOS you are not able to customize the top panel. This is quite uncomfortable. I would like to display Tomboy applet and hide Notification area, because icons on this applet are automatically resized to fit the panel size which makes some of them look really ugly (e.g. the Wuala icon).
To make the panel customizable like in other GNOME based distributions you have to go to the ~/.gconf/apps/panel folder and rename applets to for example applets_bak. After that logoff and login again. You should se a blank top panel ready to be customized 🙂