Apple has done it again with the iPhone 4. The new retina display is pretty amazing, with 326 pixels per inch and an 800:1 contrast ratio. You can read more about it in this article on Macworld. They also have hands-on article giving their first impressions of this new phone. And if you want to get a good sense for what these new phones look like, check out their slide show. And be sure to check out Apple's video about the iPhone 4.
The phone is now glass both front and back. The steel rim doubles as the antenna. You can choose between white and black models.