With AirPlay, you can "'push"' music directly from your iPhone to an Apple TV.

We've criticized the new Apple TV for its lack of streaming-media services, but we've always held out hope that AirPlay would bring the additional functionality we wanted. Today, Apple released the new 4.2 iOS update and an Apple TV update, which enables AirPlay functionality. We've had some time to play with it, and though it doesn't fully deliver on its promise yet, it's on its way to being one of the best features of the Apple TV.

What is AirPlay and how it works The idea behind AirPlay is "pushing" content from an iOS device to your Apple TV, so you can watch on the big screen. It's designed to work with music, photos, and videos, although the video functionality is limited for now.