I wrote on several occasions that Microsoft Resarch rocks. And it’s time to write it again. I just found out that the guys from MSR are implementing a research operating system in C#. It’s called Singularity.
Source 1: http://research.microsoft.com/
Source 2: http://channel9.msdn.com/ShowPost.aspx?PostID=68302
Source 3: http://research.microsoft.com/os/singularity/