Managing Hyper-V from Windows 7
If you have installed the Windows 7 beta and want to use it to manage Hyper-V you will need to install the Remote Server Administration Tools for Windows 7 beta. These can be downloaded from here:
Once you have installed them you will need to still setup your client and server appropriately (I recommend using HVRemote). One nice thing though is that the Windows 7 Hyper-V mangement UI can be used to manage both Windows Server 2008 and Windows Server 2008 R2 beta installations of Hyper-V.
Cheers,
Ben