google.com
http://news.ycombinator.com/item?id=1672391
http://news.ycombinator.com/item?id=1672388 <- This one, which is an explanation, not just an example.
http://news.ycombinator.com/item?id=1672346 <- First
http://www.google.com/instant/
Reply on news.ycombinator.com