Hyper-V Server 2008 R2 RC available now!
Overview
By having the ability to plug into existing IT infrastructures Microsoft Hyper-V Server 2008 R2 enables companies to reduce costs, improve utilization and provision new servers. It allows IT professionals to leverage existing patching, provisioning, management and support tools and processes. IT Professionals can continue to leverage their individual skills and the collective knowledge of Microsoft tools, minimizing the learning curve to manage Microsoft Hyper-V Server 2008 R2. In addition, with Microsoft providing comprehensive support for Microsoft applications and heterogeneous guest operating systems support, customers can virtualize with confidence and peace of mind.
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Note: This is a pre-release version of Microsoft® Hyper-V™ Server 2008 R2 and not intended to be used in a production environment.
Source: here