Interviewed over the phone and wrote code in a shared Google Document. The questions weren't overly difficult and the interviewer was excellent at guiding the direction of code without telling you what to do explicitly. They decided to fly me out to Mountain View and I had four technical interviews on their campus. These were much more difficult and I tired quickly after lunch. If I can recommend anything its that you should get something to wake you up before the last two interviews - its too easy to get tired and sloppy. Study up on those data structures and complexity analysis!