Although I have some doubts that XFCE is "so very much lighter" than GNOME (GNOME 2.20 doesn't take too much memory if you don't start all kind of crap), it is still lighter, and in a few years there will be less and less antiquated computers who require extra-light window managers (Fluxbox, Openbox, Blackbox, WindowMaker, IceWM).
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