Microsoft has been working hard to make the Windows 8 experience more user friendly,with the innovative Metro UI (inspired from Windows Phone) for the Windows 8 they have also made sure that the new UI also get some new features and gestures as well.
Winunleaked.tk which is getting quite popular amongst Windows 8 leaks has posted yet another great video showing of new gesture for closing the apps in Windows 8.
Video - TinyPic - Free Image Hosting, Photo Sharing & Video HostingAs you can see from the video the new gesture allows us to close the Metro Apps using the swipe down gesture i.e the active app needs to be swiped down in order to be closed down.So now you dont have to use the task manager to close the Metro apps.Mouse can also be used to perform this gesture.The gesture is currently in development mode,so we can see a more polished version in the final build.