Many people become quite perturbed at the notification icons not showing in the Vista System Tray. Also, after clicking the arrow to see all icons, it goes right back to mostly hidden view. This annoys some people. Some also may prefer to always have all system tray icons in view, in order to monitor what is going on better.If that is the case, right click on the Start menu icon and select Properties. From here, select Notification Area and remove the default check box for "Hide inactive icons". This will give the system tray a more static view of all icons, and it may be quite filled up! This, incidentally, may be a sign that too much is running on your system. Is this possible? And is it necessary? Only you, the user of the PC or laptop knows the answer.
Also, in the Notification Area, "Customize" offers some nifty options to hide or show icons, and gives a history of past tray items.