http://www.eweek.com/c/a/Infrastructure/Fastestever-Windows-HPC-Cluster/

This is indeed a moment of pride for me as an employee of Microsoft. Microsoft is a late entrant to the High Performance Computing (HPC) space. We released the first version of our HPC solution called Windows Compute Cluster Server 2003 (CCS) approximately two years back and today we are in the beta 2 stage of version 2 of it. The new version is called Windows HPC Server 2008 is due to release sometime later this year. And a solution built using beta version is already ranked # 23. Wow! The days ahead are going to be more exciting.