Microsoft Hyper-V Server 2008 is the free virtualization server OS from Microsoft. It is NOT Windows Server 2008 Hyper-V. To understand the (important) differences, see http://www.microsoft.com/servers/hyper-v-server/default.mspx.
That being said, the Beta of Microsoft Hyper-V Server 2008 R2 is now available at: http://www.microsoft.com/downloads/details.aspx?FamilyID=e464e255-cdd5-44b2-84e6-3233eae3f356
What’s new?
1. Failover Clustering and Live Migration
2. Processor and memory upgrades: up to 32-cores and 1TB of RAM
:-O
Hyper-V Server v2 will have Failover Clustering Feature?
As you might recall Hyper-V Server 2008 is a further Hyper-V optimized version of a Server Core installations