It tooks me a while and a lot of work to get the compositing manager working in xfwm4, the Xfce window manager (obligatory screenshot)
I’ve been asked why making a separate compositor rather than using X.org’s xcompmgr.
To make it short, because it makes perfectly sense. The compositor is like a WM on its own, it manages a stack of all windows, monitor all kinds on X event and reacts accordingly.
Having the compositing manager embedded in the window manager also helps keeping the various visual effects in sync with window events.
This package is to be used in place of the regular xfwm4 package from Xfce 4.2 RC2 available here