For those subscribed to TechNet the service pack is available for download:
We will be deploying the service pack to our Hyper-V servers to gain access to some of the new Hyper-V features that we are interested in including new memory commitment structures and RemoteFX capabilities.
- TechNet Blogs: The new "Dynamic Memory" feature of Hyper-V explained
- Microsoft Virtualization Blog: Explaining Microsoft RemoteFX
There is one known caveat to installing SP1 on machines that have the pre-release version of RSAT installed:
- TechNet Ramblings of a Support Engineer Blog You receive exit code 0x800f081f when attempting to install SP1 for Win7/R2
Microsoft Small Business Specialists
Co-Author: SBS 2008 Blueprint Book