Google Now cards are available in the latest Chrome Canary build for Windows and Mac (34.0.1788). You only need to go to chrome://flags/#enable-google-now , then switch from “Default” to “Enabled” and click “Relaunch Now” at the bottom of the page to restart the browser. Chrome Canary and the stable Chrome can run at the same time, but the Canary version is updated daily, has the latest features and it’s for developers and early adopters. ( more on this article… )
Seems like there is a lot going on about notifications on Chrome and Chrome OS. What’s special? Oh wait! I know why!. Google Now is getting ready for Chrome and Chrome OS. Latest update to the Google Voice Chrome extension has added support for Desktop notifications. This feature however is experimental according to the team, and can be disabled from the options menu for the extension.