Pressing the Super key and tab
<Mod4+Tab> used to work similar to pressing Alt+Tab (which switches windows just like M$), but it showed a much better preview. Somehow I lost the shortcut and can't find it anymore. I've gone through the chaos in System -> Preferences -> Keyboard Shortcuts several times and the only thing I can see there is Move between windows, using a popup window, whatever that means.
I prefer the "fancier" switcher, how can I restore it?