Free E-book on Microsoft LINQ, Microsoft ASP.NET AJAX, and Microsoft Silverlight
Source: David Hayden, Microsoft MVP C#
MSPress has apparently put together a Free E-Book that includes excerpts from three recent book releases:

- Introducing Microsoft LINQ by Paolo Pialorsi and Marco Russo (ISBN: 9780735623910)
This practical guide covers Language Integrated Query (LINQ) syntax fundamentals, LINQ to ADO.NET, and LINQ to XML. The e-book includes the entire contents of this printed book!
- Introducing Microsoft ASP.NET AJAX by Dino Esposito (ISBN: 9780735624139)
Learn about the February 2007 release of ASP.NET AJAX Extensions 1.0, including an overview and the control toolkit.
- Introducing Microsoft Silverlight 1.0 by Laurence Moroney (ISBN: 9780735625396)
Learn how to use Silverlight to simplify the way you implement compelling user experiences for the Web. Discover how to support an object-oriented program model with JavaScript.
I haven't downloaded it, but if you are looking to add to your LINQ, AJAX, and Silverlight Resources without spending any money, it may be worth looking into. Learn more here.