Replace gnome-panel with AWN, and replace gnone-wm with Compiz

AWN: If you have “Configuration Editor” (AKA gconf-editor) installed, run it and navigate to the key folder /desktop/gnome/session/required_components. Double-click on the key panel in the right-hand pane to edit it, and change the value to “avant-window-navigator” followed by the “OK” button.

COMPIZ: While on the above key, replace gnome-wm with Compiz