Previewed at WWDC, launching in the fall.
Google Releases Google Earth for iPhone and iPod Touch
With just a swipe of your finger you can fly from Peoria to Paris to Papua New Guinea, or anywhere in between. It may be small, but it brings all the power of Google Earth to the palm of your hand, including all of the same global imagery and 3D terrain. You can even browse any of our 8 million Panoramio photos or read Wikipedia articles.Google Earth integrates with the iPhone's GPS to provide you your current location, but you can also explore different areas on earth.
The application is a free download from the App Store (iTunes Link).