Airfoil is one of those standout applications you come across sometimes.
What it does is allow you to send any audio from your computer via wireless to any other computer (PC or Mac), Apple TV or Airport Express. It works with any application that plays music in your computer.
Syncing is both easy and fast. The clear GUI will list up all the devices that you can sync to, and all you have to do is activate them and set the volume and equalizer. That means you can pretty much listen to your music anywhere. Rogue Amoeba have really succeeded in making a program which is efficient, useful and very easy to use.
The download also includes Airfoil Speakers, which basically turns any PC or Mac into an Airport Express unit which can then receive audio from the Airfoil of another computer.
On the help side, the Rogue Amoeba team is known to offer great support and respond quickly to user queries.
Naturally though, if your...