More sensor fusion collusion.
Here's a potentially life-saving mobile accessory from AT&T. AT&T "Asthma Triggers" monitors surrounding air quality for potential air quality problems and uploads information via a gateway to a central AT&T service which in turn feeds information back to the user's devices such as smartphone, tablet, and laptop.
I've seen many working prototypes like this get stuck in a lap somewhere. It would be nice to see ideas like this make out into the real world. Such proactive health-monitoring services could be taken much further over the coming decades monitoring data over time and providing ongoing feedback about potential health problems. The power of sensors and the power of crowds used for good (and hopefully not evil).