Link: http://www.microsoft.com/downloads/en/details.aspx?FamilyID=ACDE41C6-153A-4181-912E-78024FCC86DA&displaylang=en

Windows® HPC Server 2008 R2 SP1 enables administrators to increase the power of the on-premises cluster by adding computational resources in Windows Azure. With the Windows Azure “burst” scenario, various types of HPC applications can be deployed to Windows Azure nodes and run on these nodes in the same way they run in on-premises nodes.

Link: http://www.microsoft.com/downloads/en/details.aspx?FamilyID=ACDE41C6-153A-4181-912E-78024FCC86DA&displaylang=en