Apple today releases iTunes 7.7 which you can update via Mac OS X Software Update or download from Apple website.
iTunes 7.7 is not just another iTunes bug fixes update, it is required for use with iPhone 3G, access to the new iPhone App Store, and for upgrade of original iPhone to iPhone 2.0 software. The free Remote application for iPhone or iPod touch allows you to remotely control your iTunes software, presumably over Wi-Fi. You enable this feature via a preference setting “Look for iPhone & iPod touch Remotes” in iTunes 7.7.
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.