that looks good, but still doesn't solve what i mean. this
          alt+tab or dash also requires a button to be pressed in order
          to be visible. in that case, it's just easier to press the
          activities button and see everything at once. 
        my point was that there should be some reminder, which is
          visible always, even when you're not switching between
          windows, or not in activities.
         
        
          
          It is planned that application icons (in alt-tab and in the
          dash) will
          show a number indicating pending notifications.
          
          See for example the Evolution icon in
          http://git.gnome.org/browse/gnome-shell-design/plain/mockups/static/app-switcher.png
          
            Giovanni