Airfoil, the handy application for sending any audio to an AirPort Express, has been updated to version 2.0.3 for Mac OS X (remember, it's also available for Windows now). This new version adds the ability to swap audio sources on the fly, as well as a menubar option if you'd rather the app not take up dock space.
Airfoil is a Universal Binary with a demo available (that overlays noise after 10 minutes until you register), while a license from Rogue Amoeba costs $25.
Airfoil v2.0.3 adds changing sources on the fly, menubar preference, more
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