Apps That Know What You Want, Before You Do - NYTimes.com

From a round-up of personal predictive analytics apps/services

"A range of start-ups and big companies like Google are working on what is known as predictive search — new tools that act as robotic personal assistants, anticipating what you need before you ask for it. Glance at your phone in the morning, for instance, and see an alert that you need to leave early for your next meeting because of traffic, even though you never told your phone you had a meeting, or where it was.
How does the phone know? Because an application has read your e-mail, scanned your calendar, tracked your location, parsed traffic patterns and figured out you need an extra half-hour to drive to the meeting."

Apps That Know What You Want, Before You Do - NYTimes.com