While I’m currently working on a ZigBee Smart Energy device running on Microsoft .NET Micro Framework 4.0  (beta) I have started a new blog writing about news concerning Smart Energy (Smart Grid) around the world: http://smartenergy-news.blogspot.com/ 
ZigBee Smart Energy offers utilities and energy service providers secure, easy-to-use wireless home area networks (HAN ) for managing energy. Smart Energy gives these groups and their customers the power to directly communicate with thermostats and other smart appliances. New advanced metering and demand response programs can be implemented in homes easily and securely because of ZigBee wireless technology. Now utilities and energy service providers can easily implement energy management and efficiency programs to meet changing government requirements.
There area a growing number of products certified  by the Alliance for ZigBee Smart Energy. These products represent every type of device needed to implement a robust home area network using ZigBee Smart Energy.