Using AirPlay

Learn how to use AirPlay to stream videos, music, and photos wirelessly from your iPhone, iPad, iPod touch, or iTunes on your computer, to your HDTV and speakers via Apple TV (2nd and 3rd generation), or to your AirPlay speakers or receivers, including AirPort Express. 

Read more...

From http://rss.support.apple.com/iphone

Troubleshooting AirPlay and AirPlay Mirroring

Use these steps if:

The AirPlay icon doesn't appear on your iOS device, or iTunes on your computer, after following instructions about how to use AirPlay or AirPlay Mirroring.
or
There are performance issues while using AirPlay streaming or AirPlay Mirroring.

Read more...

From http://rss.support.apple.com/iphone