Evidently you removed a package that creates those panels or you removed some software that, through removal, somehow reconfigured your desktop.
The first thing to try is to create a new user account and log on to it. If the panels are available for the new user then you simply have a configuration issue. If the panels are missing for the new user then you may have removed the package(s) that create the panels.
If you removed the required packages then you may be able to fix this by using Synaptic or Adept to reinstall the Gnome base system.
Last edited by stress_junkie; 12-24-2008 at 08:04 AM.