The Windows Compute Cluster Server 2003 RC has released on Microsoft Connect. Once you sign in with Passport, you can download the SDK and two labs as well. Support is provided through newsgroups.

Microsoft Windows Compute Cluster Server 2003 is an integrated, standards-based compute clustering platform built on top of Windows Server 2003 x64 Edition.

Windows Compute Cluster Server 2003 is comprised of two CDs. The first CD is Windows Server 2003 Compute Cluster Edition (CCE), and the second CD is the Microsoft Compute Cluster Pack (CCP)—a combination of interfaces, utilities, and management infrastructure that makes up Windows Compute Cluster Server 2003.