Windows 7 SP1 Beta and Windows Server 2008 R2 SP1 Beta are available for download.

Just a couple of hours ago, the Worldwide Partner Conference (WPC), now taking place in Washington, announced the availability of Service Pack 1 (Service Pack 1) beta versions for Windows 7 and Windows Server 2008 R2. We prepared in advance and created a special page in Russian, from where you can download the update package: download Windows 7 SP1 Beta and Windows Server 2008 R2 SP1 Beta

Key innovations include:

Dynamic memory lets you have your computer running. (more info here )
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RemoteFX enhances Microsoft desktop virtualization. RemoteFX lets Windows Server 2008 R2 provide users with a virtual desktop experience. If you’re listening for video, you’ll find out how to make it up.

Those who want to learn more about the changes can read the 27-page document in the English language: Windows Server 2008 R2 SP1 Beta Reviewer's Guide

My colleagues will certainly tell you about new features in the near future.