http://www.microsoft.com/windowsserver2008/en/us/hyperv-overview.aspx
Key Features of Hyper-V
New 64-bit micro-kernelized hypervisor architecture enables Hyper-V to provide a broad array of device support methods and improved performance and security.
Broad support for simultaneously running different types of operating systems, including 32-bit and 64-bit systems across different server platforms, such as Windows, Linux, and others.
Ability to support up to four multiple processors in a virtual machine environment enables you to take full advantage of multi-threaded applications in a virtual machine.
Hyper-V includes new virtual switch capabilities. This means virtual machines can be easily configured to run with Windows Network Load Balancing (NLB) Service to balance load across virtual machines on different servers.
With the new virtual service provider/virtual service client (VSP/VSC) architecture, Hyper-V provides improved access and utilization of core resources, such as disk, networking, and video.
Hyper-V enables you to rapidly migrate a running virtual machine from one physical host system to another with minimal downtime, leveraging familiar high-availability capabilities of Windows Server and System Center management tools.
Hyper-V provides the ability to take snapshots of a running virtual machine so you can easily revert to a previous state, and improve the overall backup and recoverability solution.
With support for multiple processors and cores at the host level and improved memory access within virtual machines, you can now vertically scale your virtualization environment to support a large number of virtual machines within a given host and continue to leverage quick migration for scalability across multiple hosts.
Standards-based Windows Management Instrumentation (WMI) interfaces and APIs in Hyper-V enable independent software vendors and developers to quickly build custom tools, utilities, and enhancements for the virtualization platform.
Note: Microsoft believes that most customers now expect virtualization capabilities in their server OS. However, based on customer demand, Windows Server 2008 will be able to be licensed without Hyper-V. To learn more, please visit the Licensing without Hyper-V page.
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