Apple has released iTunes 7.7 and also launched the App Store in some countries. More countries are expected to come online shortly.
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.
iTunes 7.7 is available via Software Update (but, not, for some reason, via iTunes “Check for Updates.” Go figure).
iTunes 7.7 is also available via Apple’s website here: http://www.apple.com/itunes/download/