xfce 4.4.2 and Windows/Super shortcuts
For anyone looking to use the “Windows Key” for shortcuts in Xfce 4.4.2, be sure that you do something like this before you try to use the shortcut editor:
xmodmap -e "add mod3 = Super_L"
Once that’s done, the shortcut editor will actually recognize the key. This is as much for my future reference as anyone, but if you find it useful, it was worth it.