Kirk Evans is a Microsoft Architect for the Azure Center of Excellence.
Introduction to SharePoint and Azure IaaS
Building SharePoint Apps with Windows Azure Platform as a Service
SharePoint Solutions and Architectures on Windows Azure Infrastructure Services
Understanding Authentication and Permissions with Apps for SharePoint and Office
Very cool... Virtual Earth now supports pin clustering. You can see a sample that shows pin clustering.
You can control clustering with a VEClusteringOptions class, which contains properties for the Icon and callback method.
This is a lot easier that the kludge code that I wrote for a customer awhile back, and works a lot faster, too.