After having used 16:9 wide screens for a while, I've realised that vertical space is often in short supply, while there is often unused horisontal space. A neat way to increase the amount of usable vertical space is to put the window titlebars on the left side of each window.
To accomplish this in XFCE, I've changed from XFWM to the very configurable FVWM. However, I think this could be a useful option in XFWM.
For such a feature I would recommend to use another window manager.