On Thursday, Google co-founder Sergey Brin made a surprise visit to the Web 2.0 Summit and was interviewed on-stage by John Battelle for about 18 minutes. Our full notes from that day are here, but the video above gives a good sense of where Brin’s head is at right now. Also check out his what he’s wearing on his feet at the beginning. I’m not sure if those are shoes or rubber socks.