Assign wmctrl -r :ACTIVE: -b toggle,above a desktop shortcut to make window stay always-on-top.
Nicknamed, the "X Freakin' Cool Environment". Also, Slackware Linux has nicknamed Xfce the "Cholesterol Free Desktop Environment".
Xfce is the original GTK desktop, developed by Olivier Fourdan in 1996.
It was intended to be fast and light-weight but is still one of the most customisable Desktop Environments (DEs) in BSD and Linux.
Sean M. Davis is the technical lead of Xubuntu (the official Xfce distro based on Ubuntu). Sean also seems to be one of the most active developers in Xfce at the moment, looking at the official Xfce blog.