The Appliance Test Drive — VHD Test Drive Program page has some updates:
Including a link to the free Microsoft Windows 7 90-Day Eval VHD and the Run IT on a Virtual Hard Disk – Test Drive Program, where you can download
Microsoft Windows 7 Enterprise
This download lets you evaluate Windows 7. Windows 7 has many new features and file management enhancements -- like Jump Lists and improved taskbar previews -- all to help speed you through everyday tasks. Windows 7 is designed for faster and more reliable performance. Your PC just works the way you want it to! With 64-bit support, you can take full advantage of the latest generation of powerful PCs and processors. New features like HomeGroup, an updated Windows Media Center and Windows Touch make new things possible.
Exchange Server 2010 RC for Windows Server 2008
Download this fully configured virtual machine of the latest release of Exchange Server 2010 RC. Evaluate the new capabilities of Exchange Server 2010 RC, which helps you achieve new levels of reliability and performance by delivering features that help to simplify your administration, protect your communications, and delight your users by meeting their demands for greater business mobility.
SQL Server 2008 Enterprise Evaluation for Windows Server 2008
Start evaluating SQL Server 2008 Enterprise today. SQL Server 2008 Enterprise provides a trusted, productive, and intelligent data platform that enables you to run your most demanding mission-critical applications, reduce time and cost of development and management of applications, and deliver actionable insight to your entire organization.