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

FORBES: Magazine Article

His proof-of-concept was crafted from 22 webcams and some custom code, but when Kinect came out, he realized that he could use the sensor bar instead.

ENGADGET: Kinect Accelerator company profiles: Freak'n Genius, GestSure Technologies, Kimetric and Styku