The Microsoft HPC Pack 2008 R2 has been updated to 'Beta 2'. There are a number of new scheduler features in this release, including the ability to send notification email on job completion, many more levels of job priority, and SOA sessions can now exclude nodes that have previously had jobs fail on them. 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