Similar to Daniel’s [Toggle Twitter](http://www.red-sweater.com/blog/1646/toggle-twitter) AppleScript that would activate or hide your Twitter Client of Choice, Jesse Gardner’s Toggle Audio script will switch between the various audio output options you may have.
I have two audio output devices: my Internal Speakers and my [Yeti Stereo Microphone](http://amzn.to/g2f0Ec). I plug my headphones into the Yeti when I’m recording a podcast or talking on Skype, but if I’m listening to music then I’ve just got the Internal Speakers playing. And now, using [FastScripts](http://www.red-sweater.com/fastscripts/) to set a hotkey (CMD+OPT+A), Jesse’s script automates the switching process for me. Lovely.
([Via Chris Bowler](http://log.chrisbowler.com/post/3236078227/toggle-audio-output).)
**Update:** Many people are mentioning another shortcut to toggle the audio output: holding the Option key and click on the volume icon in the Menu Bar. I did not know about this shortcut; very cool. However, I’m sticking to the AppleScript because I prefer the least amount of icons in my Menubar as possible.