If you want to update your skills and bring your knowledge to the next level with Microsoft Visual Studio 2008 technologies, you can now navigate to this page of the Microsoft Learning portal and download the following e-books for free:

• Introducing Microsoft LINQ by Paolo Pialorsi and Marco Russo by Paolo Pialorsi and Marco Russo
  
• Introducing Microsoft ASP.NET AJAX by Dino Esposito (Solid Quality Learning) by Dino Esposito
  
• Introducing Microsoft Silverlight 1.0 by Laurence Moroney by Laurence Moroney

To get the entire book content you first have to register yourself.

Enjoy!