As far as I know, I've only had Google Now in my Dev Channel Chrome for some months. Has it really already arrived in the Stable Channel? And in that case, wouldn't that have required the version numbers of all the channels to be bumped up (the Dev channel have been v35 since late February)? As far as I know features don't make it down the channels (Dev -> Beta -> Stable) individually (e.g. by being "cherry-picked") - they instead stay within the version where they where first added.