First tip of the week is MS Dev Show episode 15, Azure Event Hubs with Dan Rosanova, length 55:19.
Azure Event Hubs is a highly scalable publish-subscribe solution capable of millions of events per second. You can use it to connect all kind of devices for example thermostats sending temperatures to an event hub and which you then can display in an app on your phone. Or something like that. Anyhow, this is one more awesome feature that makes Azure such a cool thing.