I'm glad XFCE is finally getting the attention it deserves. It is clean, simple, usable, and well-designed. Gnome 3, while arguably having better design, has awful usability.
XFCE is not the same "lightweight" desktop environment it once was. That task is now handed over to LXDE.
http://www.archlinux.org/packages/extra/i686/xfce4-panel/
I can't find anything GNOME-related here, unless you are talking about GTK (which you probably would already have on your system if you want the xfce-panel).
It works for me. I have "mastered" the windows concept and now I just want to use my computer to get stuff done, not learn a new UI concept every other day (unless it involves substantial improvements to my experience).