I’ve featured Microsoft’s Technet before; but now Microsoft has even more to offer at their TechNet site. And 99% of it is free. The how-tos and downloads are unreal. You can’t possibly read all of the material but it is the best resource for Microsoft products.
With thousands of articles, Technet is broken into categories where you can narrow down your search for what you need.
Articles are added daily along with scripting and every operating system you can imagine. Visit the gallery here or visit on-line learning, virtual labs and the learning center and certification information.
Can’t get enough information? Here’s the Microsoft Wiki which has an unbelievable amount of resources and links. Need drivers, service packs or other downloads including evaluations? Visit there download center.
Below is a tiny portion of their resources.