Microsoft recently released a September Refresh of the Windows Azure Software Development Kit. The SDK still remains the same as the one released in June/July, but with a few bug fixes and some additions, including the following:

• Support for .Net 4 based services
• Support for IntelliTrace to debug Windows Azure services
• [Microsoft.WindowsAzure.StorageClient.dll] Application crashes with unhandled NullReferenceException that is raised on a callback thread.
• [Microsoft.WindowsAzure.StorageClient.dll] MD5 Header is not passed to the Azure Blob Service in block blob uploads

Download the September Refresh of the Windows Azure SDK.

The Windows Azure SDK provides developers with the APIs, tools, documentation, and samples needed to develop Internet-scale applications that run on Windows Azure.