Automatically mute all sounds when you are away from your computer.
MacAutoMute is a Preference Pane that allows you to automatically mute all Mac sounds when you are away from your computer and the screensaver goes on. This was a -surprisingly- missing feature on mac. But now it's here and even free. I encourage my users try our app for free. If you find it useful, please come back to macautomute.com and get the "0,99 bucks version", donating what you want.
Find other details on macautomute.com