Microsoft released the RC1 of Windows 7 and Windows Server 2008 R2 SP1.
"Improve the efficiency and availability of IT resources and applications with new virtualization innovations provided in Windows 7 and Windows Server 2008 R2 SP1 RC. Dynamic Memory and Microsoft RemoteFXTM, to help businesses further optimize their datacenter and desktops."
Dynamic Memory lets Hyper-V administrators pool available memory on a physical host and dynamically distribute it to any virtual machine(s) running on that host. [More Info: White Paper]
Vijay Demos Dynamic Memory in Hyper-V on Windows Server 2008 R2 SP1:
RemoteFX lets Windows Server 2008 R2 administrators provide a rich end user desktop virtualization experience by delivering vivid content, independent of any graphics stack, to server-hosted virtual and session-based desktops. [More Info: White Paper]
RemoteFX in Server 2008 R2 SP1 with Michael Kleef:
More Info: Download