Yeah you don’t have to buy they are offered freely by Microsoft as Ebooks:
For coders:
Programming Windows Phone 7, by Charles Petzold
Moving to Microsoft Visual Studio 2010
Parallel Programming with Microsoft .NET
Introducing Microsoft SQL Server 2008 R2
Microsoft Application Architecture Guide, 2nd Edition
For administrators:
Introducing Windows Server 2008 R2
Deploying Windows 7, Essential Guidance
Read more: Savetime On
For coders:
Programming Windows Phone 7, by Charles Petzold
Moving to Microsoft Visual Studio 2010
Parallel Programming with Microsoft .NET
Introducing Microsoft SQL Server 2008 R2
Microsoft Application Architecture Guide, 2nd Edition
For administrators:
Introducing Windows Server 2008 R2
Deploying Windows 7, Essential Guidance
Read more: Savetime On