iPhone 2.0: Remote
The Remote is one of Apple's own applications rolled out for free over the App Store for the new iPhone software and it is absolutely brilliant, with an amazing user interface and flawless integration. It's the best iPhone application I've used yet and I just love it! It sets the perfect example of an iPhone app. In this particular case, only Apple could have made the integration really seamless, because it required some changes in iTunes as well, so this Remote only works with iTunes 7.7 and later, if I'm right.