Integrated Microsoft Hyper-V Server 2008 R2 SP1 available for download

If you have an existing installation of Microsoft Hyper-V Server 2008 R2 (the stand alone version of Hyper-V) you can install service pack 1 by following the process that is outlined here:

But if you are setting up a new Hyper-V Server you can grab the integrated installer from here:

This will allow you to use dynamic memory and RemoteFX without having to get a full Windows Server.