Smart Dust

In the 1990s, a researcher named Kris Pister dreamed up a wild future in which people would sprinkle the Earth with countless tiny sensors, no larger than grains of rice.

it seems its become more relevant these days.

Combination of IoT technology and  Nano Computer manufacturing would make this dream a reality.

Sources:

http://edition.cnn.com/2010/TECH/05/03/smart.dust.sensors/index.html