http://blogs.technet.com/nymciblog/archive/2009/05/06/hyper-v-server-r2-rc-available.aspxJust in case you missed it with all the announcements around the public availability of Windows Server 2008 R2 and Windows 7 Client Release Candidates in the last week. Microsoft has also made the Hyper-V Server R2 RC available for download here Hyper-Ven-USCommunityServer 2.1 SP1 (Build: 61025.2)