Search Mash is a site for testing out new Google interface ideas, although the current test looks a bit like A9.
Click the “more web pages” button at the bottom of the first serp. There’s a very cool scrolling feature, which I certainly hope they implement. SEOs will love that, as it will make it easier for users to search beyone the first couple of pages.
I always liked A9, but their marketing was a disaster, in my humble opinion. A9 appears too corporate, and they really need someone to take those great ideas and get grassroots buy-in. The Amazon data gives it a great edge over other competitors.