Access Microsoft Learning site for windows 2008 and click on the Register for the free e-book. It requires one to setup a windows live id which is the easiest thing to do. I have done the same using my yahoo id and it works well. Then register yourself and it will give access to few chapters from the e-books about windows 2008 and PowerShell, a technology which took so long to appear in windows.
After that using the link, Manage My Learning, one can always check back the contents. I really found this a good way to know what's coming up now in the windows server market.