VMWare have announced availability of VMWare 6.0 beta, well I've only just noticed.

• Support for Windows Vista - Use Windows Vista as host operating system
• Multiple monitor display - You can configure a VM to span multiple monitors, or multiple VMs to each display on separate monitors
• Integrated Virtual Debugger - Workstation integrates with Visual Studio and Eclipse so you can deploy, run, and debug programs in a VM directly from your preferred IDE
• Automation APIs (VIX API 2.0) - You can write scripts and programs to automate VM testing
• Headless mode - You can run VMs in the background without the Workstation UI

More info at http://www.vmware.com/wsbeta

I'm very interested in the integrated virtual debugger, sounds like it would be great when testing and debugging on non-standard environments.  Headless mode also sounds cool when you just require SQL Server or a domain controller for testing purposes in the background.  Download for Windows is 167mb.