Smart Dust is making news again. This time in an ABCnews.com article on experimental use of Smart Dust by the US Marines. Smart Dust is down to 5 cubic millimeters and the next generation is expected to hit the 1mm mark. The MEMS-based, sensor-laden dust could be dropped by UAVs, drifting undetected to the ground. Vehicle and troop movements would then be monitored and transmitted back to base. Commercial dust motes are also available for those who'd like to experiment.