Cold-storage-device maker Sensitech attached Ember nodes to temperature gauges on refrigerated trucks.

FORBES: EMBEDDED NETWORKS

There are also nodes that turn the device into a flashlight and game controller -- modularity is the key here.

ENGADGET: Node modular iOS sensor hands-on Hands-on

The idea is to have lots of access points but make the access nodes as dumb as possible and move all processing activity to a central device.

FORBES: Magazine Article