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
Jon Flanders quote of the night...
"Indigo is just another [BizTalk] adapter."
Kent Tegels followed up with "Actually, it's just another SQL Server Service Broker endpoint."