
Prior to Mountain Lion, if I wanted to switch my audio input or output from my speakers to a headset microphone, I used a free app called SoundSource. Unfortunately, SoundSource isn’t compatible with Mountain Lion. Fortunately, there’s an equally easy way to select your audio sources on a Mac, going back at least as far as Snow Leopard.

If you’re like me, since you’ve upgrade your Mac to Mountain Lion, even the default four seconds that a notification remains on the screen can bug you. You could disable notifications entirely, or even for a period of time, but that might be too extreme for your situation. Instead, to get rid of a single alert immediately, do a two-fingered swipe on the alert banner, from left to right, and it will disappear from the screen.