Riviera is a sample application for Windows Azure available on MSDN Code Gallery for download. Riviera has been developed by Platform Evangelism group in collaboration with Cumulx who are a Cloud ISV partner. Key features of Riviera are:

• Multi-tenant data store based on Azure Table Storage as well as SQL Azure.
• Per tenant customization of data model
• Per tenant customization of business logic (using Windows Workflow in Windows Azure)
• Per tenant customization of user interface using Silverlight 3.0. Customization can be multi-level – custom theme, custom XAML, and custom XAP.
• Automated tenant provisioning
• Windows Azure web role->Azure Queue->worker role pattern for high volume transaction processing that can scale on demand
• Claims aware web service and web application using Geneva Framework
• Active and Passive Federation using Geneva Framework, Geneva Server and .NET Access Control Service (ACS)
• Windows Live ID authentication for consumer facing web site
• Use of Patterns & Practices Enterprise Library Caching and Logging application blocks in Windows Azure

As you can see from the list above that Riviera uses many features of Azure. This makes it an excellent sample to learn from. Assuming that Windows Azure is not too far from RTM, developers should start sharpening their Cloud Computing skills.

Link To Riviera home page.