It was a warm day in Helsinki. Minus five. And I found myself walking beside the city’s frozen lake, talking about Web analytics. Jouko Ahvenainen heads an analytics firm which has hit upon an idea. Over lunch beside a wintery, but beautifully sunlit setting, we talked about the dramatic changes which are about to take place in the mobile industry. Jouko runs Xtract which has traditionally been a high-end anlytics