For decades, visions of the future have played with the magical possibilities of computers: they'll know where you are, what you want, and can access all the world's information with a simple voice prompt. That vision hasn't come to pass, yet, but features like Apple's Siri and Google Now offer a keyhole peek into a near future reality where your phone is more "Personal Assistant" than "Bar bet settler." The difference is that the former actually understands what you need while the latter is a blunt search instrument.

Google Now is one more baby step in that direction. Introduced this past June with Android 4.1 "Jelly Bean," it's designed to ambiently give you information you might need before you ask for it. To pull off that ambitious goal, Google takes advantage of multiple parts of the company: comprehensive search results, robust speech recognition, and most of all Google's surprisingly deep understanding of who you are and what you want to know.