I put together a talk that includes a lab on building a security/home automation system using 11 netduinos communicating over MQTT with a broker located in Windows Azure. The attendees of this talk will walk through the lab and build out various components of a security system.
Here is a video demonstrating the various components of the system.
The source for the project can be found on github:
The Security System website is hosted on a Web Role and it contains all the documentation for the lab.