Spike Software (http://www.spikesoft.net) has launched Audio Switcher 2.0, a Mac OS X utility that allows you to switch your audio input and output between different audio devices.
Automatically detecting when your audio devices are connected or disconnected, the tool resides in the Status Bar. Version 2.0 expands support for a wider range of devices.
Audio Switcher requires OS X 10.7 or later and costs US$4.99. It’s available at the Mac App Store in the Utilities category.