Recently, the Zigbee Alliance released standards for Medical oriented devices to allow standardized interoperability for device functions. Eventually, this should allow worthwhile peer- to peer functionality on the 802.15 network, over and above centralized monitoring applications. I can see this functionality built on Zigbee being very useful in elder care facilities, because of its interaction with home control devices. The aging population will be a growing market in the next few decades, and minimally supervised residential housing is likely to boom, especially as economics nudge retirees from living in expansive homes. So this is a prime market opportunity.