Introduction
This is an Alfred workflow for changing the OS X input and output audio devices. Under the hood it uses SwitchAudio from deweller on GitHub.
For more information and pretty pictures, I made a blog post about this when I initially wrote it. http://michael.thegrebs.com/2013/01/18/alfred2-audio-device/
Installation
Click the releases link above ----^ then click the green button to download the latest binary release. Once downloaded, double click the file and Alfred will prompt you to import it.