Google's latest mobile helper is an extension of Android's Google Search app. Google Now expands the personal assistant concept popularized by Apple's Siri by anticipating your needs and providing useful information at the right time. It does so by automatically displaying "cards" that contain location- and time-relevant details. When you're at the airport, for instance, Google Now will find your boarding pass in an email and post it on your smartphone's screen. (As of mid-December, this feature works with only a limited number of airlines.) Google Now debuted in June 2012 at Google I/O, and is currently limited to Android 4.1 and up. It shows great potential to make mobile devices much more intelligent and useful.