This has me well pleased. You know how it is....you wanna try out and learn something and you run up a Virtual machine but cant quite work out how to do it. TechNet have just released the Virtual Labs at http://www.microsoft.com/technet/traincert/virtuallab/default.mspx. You can learn about Windows Server, ISA, Exchange and more and all the stuff thats in them like the new DFS-R stuff.
Theres even developer ones at http://msdn.microsoft.com/vstudio/tryit/hosted/
Give them a shot and let me know what you think!