Airfoil for Snow Leopard updated to version 4
Rogue Amoeba has rolled out Airfoil 4 (http://www.rogueamoeba.com/airfoil/mac), an upgrade to the tool for streaming audio around the house.
Originally designed to send any audio to Apple’s Airport Express router (which supports only iTunes by default), Airfoil has grown to support streaming to the Apple TV, as well as other
computers running Airfoil Speakers (on Mac OS X, Windows, and Linux), and even to iOS devices such as the iPhone, iPad, and iPod Touch.