Today, Microsoft released the first public beta of Microsoft Windows HPC Server 2008, a server operating system and tools designed for the fast-growing high-performance computing (HPC) market. Microsoft also established the Parallel Computing Initiative, a program creating a set of common development tools across multicore desktops and clusters.
You can read more about it in The Manycore Shift White Paper. This paper describes how Microsoft and industry partners are working together to enable businesses, software and hardware vendors, and individuals to take advantage of the “manycore shift”.
Source: The Manycore Shift white paper