Recently Giovanni posted a document on the Windows HPC community portal describing how to set up a virtual HPC cluster. The ZIP file (did he use his MacBook to write the doc? :)) contains also sample code that can be executed against the virtual cluster and examples that show how to use the new admin tools.
The only caveat, you have to have some experience with installing Windows Server and Windows administration in general. This is not a simple "click through" guide. Giovanni promised to update it once we have beta 2 of Windows HPC Server 2008 out.