Microsoft of course would like us all to upgrade to Server 2012 as soon as possible, so they have released a free eBook about the newest edition of Windows Server. The book is available in PDF, MOBI and EPUB:
Microsoft are putting the most popular TechEd North America Hands-On Labs available online. To get your hands on this information, head over to the TechEd website and sign-in with your myTechEd account (the Labs can be found in the TechEd Content Catalog) - TechEd Hands-On Labs (myTechEd)
If you don’t have a myTechEd Membership, it’s free to create one and you will gain access to 2011 and 2012 recorded sessions.