The Microsoft Learning Center on TechNet offers a huge library of learning resources, including classes, books, online training, and more. You can also subscribe to different learning plans to help you train for a certification exam or specific IT task. These learning plans contain links to classes you can take (generally for a fee), TechNet resources, books to read, webcasts, labcasts, and other resources. You can obtain a pretty decent education just by going through some of the free links, but some of the courses are available online for very reasonable prices (I found one offer for six online courses in implementing Microsoft Office SharePoint Server 2007 for $191 for an 18-month subscription). They also provide some of their courses for free—check out the Free Products in the Microsoft Learning Catalog.
– Andrea Weiss