Charles Lieber 's Harvard spinout Nanosys anticipates having a commercial nano-enabled sensor product within the next three years.

FORBES: Nanotech On The Front Lines

Another kind of sensor technology, the nano bar code, is being developed by Nanoplex Technologies in California.

FORBES: Magazine Article

Packing four sensors into a housing smaller than an iPod Nano, the CORE 2 will be the smallest wearable multi-sensor device of its kind as well as the first to offer a choice of interchangeable jewelry- like faceplates, straps and cuffs for a fashion look.

ENGADGET: BodyMedia's CORE 2 armband tracks your health, or lack thereof