One of the most valueable thing is knowledge, therefore every way we can have access to it is most welcome.
Microsoft has over the years been releasing e-books for free on their technologies, and now we have a MONSTER list:
- Azure and Cloud
- Visual Studio and TFS
- SQL Server
- and more
you can find these e-books at this link: http://social.technet.microsoft.com/wiki/contents/articles/11608.e-book-gallery-for-microsoft-technologies.aspx