Last week Ryan in the team released the Azure Issue Tracker sample application. This demo demonstrates multi-tenant ISV and SaaS solutions using a number of the Azure Services Platform components and is hosted in Windows Azure. The first release is the Standard version, which shows federation with Windows LiveID users, integration with SQL Data Services, and the core claims-based authorization model and architecture using the .NET Access Control Service. You can download the Standard version today from the Codeplex project page.
You can also follow Ryan’s blog as he will drill down into the architecture of the solution.