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My work colleagues run a highly customised fvwm, which is a little too hardcore for me
I opted for XFCE when I started working at my current company.
My Linux dev box is an old PIII with a 16mb graphics card and XFCE runs great.
I originally had Gnome on the box, which was just too slow.
When it comes to productivity, a responsive desktop is of major importance - and eye-candy really is a waste of time.