Google has announced that its Google Mobile App for iPhone now comes with Voice Search, a feature that lets you speak your query and get Google results back using the new iPhone formatted result page. If Location Services is enabled on your iPhone, it will also use your location to present geographically relevant links (like the nearest restaurants).
Among the other features of the Google Mobile App are Google Suggest, a search history, easy access to other Google products like Maps, Gmail and News from the Apps tab, and more.
The Google Mobile App is available for both the Apple iPhone and iPod touch through the Apple App Store.