Windows Vista trial virtual hard disk

This is nice – a 30 day evaluation version of Windows Vista Enterprise, pre-installed with Virtual Machine Additions already loaded.  You can download it from here:

Note that while the download page says that you need Virtual Server, the virtual machine works fine with Virtual PC 2007.  The virtual machine is configured with 768mb ram and a disconnected network card – so you may want to fix that up before you get going.