This is really great news, particularly for the vast number of administrators in Higher Education who have adopted Hyper-V for all or part of their virtualization workloads!  This entry from the Hyper-V team explains a new support agreement between the two organizations that will bring integration components on both sides (Windows virtualized on Red Hat and Red Hat virtualized on Windows).

http://blogs.technet.com/virtualization/archive/2009/02/15/Microsoft-and-Red-Hat-Joint-Technical-Support.aspx