If you have not had a chance to watch anything from Build yet I would highly recommend starting with the day two keynote with Satya Nadella. These are some of the riskiest (and best) demos I've seen at a Microsoft conference to date. Beyond the risk and showmanship they really demonstrated how developers can use Windows Azure to make great applications. There were five major demos for Windows Azure that highlighted many of the ways developers can build connected applications and highly scalable back ends to create impressive applications.
Windows Azure is a flexible and open cloud platform for a wide variety of applications ranging from web sites to enterprise and mobile applications. In this video, Scott Guthrie will demonstrate how to quickly build and deploy applications using the new Windows Azure features and services including Windows Azure Web Sites, Virtual Machines, and new developer tools and SDKs.
Mark Russinovich goes under the hood of Microsoft’s cloud OS, Windows Azure.
3-026 Learn from a developers perspective how to use Windows Azure Virtual Machines to run your workload in the cloud.