Google wrote their own engine after hiring away a bunch of the top guys from Nuance. They started it with Goog-411, training it on requests like "Pizza in Oreg

Google wrote their own engine after hiring away a bunch of the top guys from Nuance. They started it with Goog-411, training it on requests like "Pizza in Oregon" where they'd know if they were right or wrong because people would request another listing if they weren't quite correct. This is the next step of that, so far as I understand. They're giving it a broader base of phrases to work on. I imagine the ultimate goal is to throw it up against Youtube, so you can search for a phrase, and Google will give you YouTube videos where someone speaks it.