Airfoil 3.2.1

An Airport Express will let you listen to iTunes over your home stereo speakers. Airfoil is an application that takes that simple functionality and (as it were) turns it up to 11. The iTunes-Airport Express combo is perfect for listening to iTunes on your nice stereo--but what if you want to hear music from a browser-based app like Pandora? Or Sirius Radio through an app like StarPlayr? Airfoil lets you send audio from any application (or even your system audio) to your Airport Express, so you can use your stereo for anything from RealPlayer and QuickTime to browser apps like Pandora. In the latest version, Airfoil has gotten even better by letting you send synched audio to multiple Airport Express units all over your house, as well as to Apple TVs and even other local computers (Mac or PC, all you have to do is install the free Airfoil Speakers mini-app). On top of that, Airfoil also now comes with a built-in video player that lets you play video on your computer with synched audio --so you're no longer stuck with using headphones or your built-in computer speakers to watch movies. Unfortunately, the trial version only gives you a draconian 10 minutes of playback. That's enough to show you what Airfoil can do, but it might not be enough to convince you it's an app you can't live without.