Beta 2 of Virtual Server 2005 R2 SP1 has been made available for public release. For more information, sign up at http://connect.microsoft.com
Beta 2 introduces support for AMD Virtualization Technology (formerly Pacifica) for hardware assisted vitualization. Beta 1 previously introduced this support for Intel VT.
Beta 2 also introduces VSS support, a long asked for capability to be able to perform snapshot backups, and support for mounting of Virtual Hard Disks.
Source : Bink.nu