Playing Spotify (and other audio) via AirPlay

Two of my favorite things working together: Spotify & AirPlay.  This tip lets you play your Spotify library for free on your home theatre! 

If you have a Mac, simply hold down the option key when you click on the audio menu option.  You can then send just the audio to an Apple TV or AirPort.  If you're on Windows, you'll need to use something like Airfoil for Windows.

Take a look at this article from Cult of Mac for other cool uses for the option key.