Well all that is true until Google launches something like siri but better, because they have been doing voice recognition and (of couse) search for long time.
(As an aside; I think this is a completely fair use of patents. You're creative, you make a new patent, you get to exclusively use that technology for the next X years to build market share)
Their UI is pretty radically new and it's reasonable to assume aspects of it are patented. I don't know of a competing product that works the same way.