iPhone and iPod Touch = iTunes and Apple TV Remote Control
Here you go.
The new freebie from Apple that turns your iPhone or iPod Touch into a remote control.
It handles Apple TV and iTunes over the WiFi network to play, pause, skip and shuffle your songs that are stored in your iTunes library.
You can access playlists, album art (displayed in the Remote app) and the ability to control AirTunes speakers and search your entire library.
No video support though but it is FREE!