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Give it a few months, and I think you will see this.

They demoed this at //build/ last year...and then it never actually happened. I have no idea why. I assume it's coming, but have no idea when, at this point.

You can use Google Now in Chrome now.

I don't think you can talk to it though, you can just click an alert button and see your cards.

Separately there is the hot word plugin (I think that's what it's called) that lets you say 'ok Google' when on the US Google homepage.

In due time.