“Use iTunes 7.7 to sync music, video, and more with iPhone 3G, and download applications from the iTunes Store exclusively designed for iPhone and iPod touch with software version 2.0 or later. Also use the new Remote application for iPhone or iPod touch to control iTunes playback from anywhere in your home – a free download from the App Store.”
The new Remote application for the iPhone and iPod touch devices controls your Apple TV and iTunes via the Wi-Fi connection. You can literally use it to play, stop, pause, skip or shuffle your songs and videos, you can even search the entire libraries through your handheld device.