Google updated the search app for iPhone and unveiled a completely new interface that uses gestures for navigation. There are only two gestures, but they're so simple, powerful and intuitive that I'm sure they'll be used in other mobile Google interfaces.
"When browsing through search results or looking at a webpage, you can swipe down to see the search bar or change your settings. (...) We also included a new toolbar that will make it easier for you to filter your results. You can open this toolbar by swiping from left to right — either before you search or once you've got your results," explains Google.
The new gestures are easy to learn and they're more expressive than buttons. You can swipe down to see the search box even after clicking a search result.