http://piecesoflint.wordpress.com – Before I tell you how to enable the old UI, let me just say that the GNOME 2 UI is deprecated for various reasons and WILL NOT RECEIVE FUTURE UPDATES. The old UI is considered a “Fallback Mode” for users who cannot use the current UI and is not intended to be used any longer if your system is powerful enough to use the new GNOME 3 UI. (HowTos)