Download content for Azure, ASP.NET, Office, SQL Server, SharePoint Server and other Microsoft technologies in e-book formats. Reference, guide, and step-by-step information are all available. All the e-books are free. New books will be posted as they become available.
here is the link: http://social.technet.microsoft.com/wiki/contents/articles/11608.e-book-gallery-for-microsoft-technologies.aspx
Enjoy!
Jose