The 2nd release candidate is now available for beta community participants. You can download the bits by registering as a beta participant at http://connect.microsoft.com. See the “Windows HPC Server 2008 beta program”.
A significant new feature with RC2 is the ability to schedule jobs using applications designed to offload processing to multi-core graphics cards. A white-paper published within the beta program downloads section details this feature. A typical command line to submit a graphics processor job uses the new HPC_ATTACHTOCONSOLE environment variable as follows: “Job submit /env:HPC_ATTACHTOCONSOLE=TRUE mygpgpu.exe”