The Microsoft HPC Pack 2008 R2 has been updated to 'Beta 2'. There are a number of new admin-related features in this release, including the ability to join Win7 workstation nodes to the cluster, create a new custom WIM based on an installed compute node, and a new node patching wizard. Come check it out!
If you have never joined the HPC Pack 2008 R2 beta program you can do so here: http://connect.microsoft.com/HPC/InvitationUse.aspx?ProgramID=3069&InvitationID=3gen-FD4X-XGF7
Otherwise you can access the new downloads here: http://connect.microsoft.com/HPC