For the techies among you, there's loads of great content on the whole suite of Virtualisation technologies here:
It's a great one-stop-shop for all things technical, around Hyper-V, Application Virtualisation, Presentation Virtualisation, Solution Accelerators and more.
For the non-techies among you, this is your one-stop-shop:
Loads of great information, including a host of case studies...
I see over on Matt's blog that we now have a Virtualization Tech Center up on TechNet. Not so pretty,