And if you use some of the lightweight window managers (Awesome, XMonad, Ion), they've all pretty much decided that the Windows key is the modifier to use for a

And if you use some of the lightweight window managers (Awesome, XMonad, Ion), they've all pretty much decided that the Windows key is the modifier to use for all window-manager shortcuts. Every app gets to use Ctrl & Alt however they like. Win+key is for the window manager itself, and is very convenient.