We just published an updated case study at:  http://aka.ms/sxp

Using Windows Azure to Build and Expand Microsoft.com Social Media Capabilities

The Social eXperience Platform (SXP), which is powered by Windows Azure® and SQL Azure®, has been providing Microsoft.com with social media features for over eighteen months. The Windows Azure platform has enabled SXP to grow and expand its capabilities on Microsoft.com by delivering performance, scalability, elasticity, and remarkable return on investment (ROI).