Google Maps Navigation can be accessed via car dock mode on Android 2.0 phones. For certain devices, placing your phone in a car dock activates a special mode that makes it easy to use your device at arm’s length. More videos after the break
a demonstration of Google Maps Navigation (Beta), an internet-connected GPS navigation system that provides turn-by-turn voice guidance as a free feature of Google Maps on Android 2.0 phones.
With Google Maps Navigation, you can search by voice. Speak your destination instead of typing (English only): “Navigate to the de Young Museum in San Francisco”.


great
, saw it when I was going to post it in Android section , hope we will see this for iPhone too (there are some rumors)