Airfoil Source Selector is a makes it easier to connect Airfoil to applications.
Airfoil Source Selector is a small application that makes it even easier to connect Airfoil to different applications:
Line In
Camino
Firefox
iTunes
QuickTime Player
RealPlayer
Safari.
Click the application's icon in Airfoil Source Selector to get Airfoil to hijack the audio.
If a sound source application cannot be found when Airfoil Source Selector launches, the related icon will be disabled.