One of the cool things about the Galaxy S III is the system feature called Smart Stay, the feature basically uses the front-facing camera of the device to see if the user is looking at the device, if so the screen stays on, if not the screen shuts down. This feature will be coming to Google Play very shortly so that other Android device owners can use it, (restricted to certain models, for now) should they have a front-facing camera of course. It’s expected to be available on the Play Store on June 29th, but for those of you that want to become a beta tester then click the second source link below. Are you going to give it a try?
Source: XDADevelopers, XDAForums