Anyone who's ever tried to text while driving can attest to the fact that the annoying thing about smart devices is that you have to look at them. No matter how intuitive a device is, no matter how great the UX/UI, it's still a big plastic blob standing between you and your info.
The next stage of interface design is biointegration, which goes a step beyond the hands-free convenience of wearables and integrates smart devices with the human body. Regina Dugan of Motorola Mobility recently wowed us all by bringing ingestible sensors and authentication tattoos to AllThingsD; now, neural dust looks to be the next step in devices that live in your body instead of in your pocket.
Neural dust is essentially dust particle-sized sensors that can be inhaled into the brain. These sensors can then communicate with other devices, gathering and analyzing multiple forms of data about what's happening in your brain.
The convenience of a device such as neural dust versus its obvious health and security risks is worth a discussion. But for now, it's just pretty rad to marvel at how far smart devices have come and think about how such devices could change lives for the better.