He gave a talk at google on the subject, it's a great watch: http://video.google.com/videoplay?docid=3897010229726822034 http://video.google.com/videoplay?docid

He gave a talk at google on the subject, it's a great watch: http://video.google.com/videoplay?docid=3897010229726822034 http://video.google.com/videoplay?docid=3897010229726822034