I did a switch back to WindowMaker, and after having a useless window key for so long, I finally figured a decent use of the window key. It does nothing but window management functions when chorded with another key. I setup the following bindings:

• I changed what was Alt+Tab to Window+Tab.
• Window+number switchs to a numbered window.
• Ctrl+Window+number switches workspaces.
• Window+F4 closes the window.
• Window+F11 and Window+F12 call up WindowMaker's desktop menus
• Window+H hides the window and Window+M minimizes
• etc.

If you've caught the gist of this rebinding, anything window manager related got a window key chord. I think this is an extremely proper use of this key. If only Microsoft would expand its use to more than just popping up the start menu.