Ember Embedded RF
Written on the original Movable Type site and recovered from the Internet Archive.
Startint to look at Zigbee deals. These guys have been at it for awhile. Ember - Embedded Wireless Networking
The question I have is what have they really built? Simply implementing standards is not interesting. The hardware parts are not interesting. The middleware, datamining, security, authentication, and other software pieces may be. As well as the network operator pieces.