I ran across this post from Eric Ligman a couple of months ago that I thought could prove useful to a wide audience.  In it he shares links to a TON of FREE Microsoft eBooks.  Check it out!

http://blogs.msdn.com/b/mssmallbiz/archive/2012/07/27/large-collection-of-free-microsoft-ebooks-for-you-including-sharepoint-visual-studio-windows-phone-windows-8-office-365-office-2010-sql-server-2012-azure-and-more.aspx