Do you want to see something seriously cool?
Check out the MS vLabs at
http://www.microsoft.com/technet/traincert/virtuallab/default.mspx. There's a short registration process, but no email verification. The vlabs provide you with a script and then let you open a pre-built Virtual Server instance in your Web browser. These aren't demos - these are fully functional server instances. Sweet. You can walk through a lab script to demo or learn about particular features without having to build an environment. I got my start at Microsoft writing various labs and how-to classes, and we always had to include 5 pages of instructions on how to build out your Lab environment; now it's pre-build with a browser link. If you want to re-start you don't have to rebuild an environment, you just re-start the lab session. Imagine using this for something like a learning lab to help with deployment or rollout - I'll be keen to see where people take this technology.