Free Chapters from 3 Microsoft Press Books

Programming Microsoft LINQ by Paolo Pialorsi and Marco Russo
* Chapter 6: Tools for LINQ to SQL
* Chapter 16: LINQ and ASP.NET

Introducing Microsoft Silverlight 2, Second Edition by Laurence Moroney
* Chapter 1: Introducing Silverlight 2
* Chapter 2: Using Expression Blend with Silverlight 2

Programming Microsoft ASP.NET 3.5 by Dino Esposito
* Chapter 3: Anatomy of an ASP.NET Page
* Chapter 18: HTTP Handlers and Modules
Free Book Chapter from Facebook: The Missing Manual

One free chapter can be downloaded in pdf format from Facebook: The Missing Manual. The free chapter is Chapter 4: Sending Messages to Friends.
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Free chapter from The Art & Science Of CSS

One free chapter can be downloaded in pdf format from The Art & Science Of CSS. The free chapter is Chapter 5: Forms.
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Free first 3 chapters from Simply JavaScript

First three chapters of Simply JavaScript can be downloaded for free in pdf format.
Free chapters are: Chapter 1: The Three Layers of the Web, Chapter 2: Programming with JavaScript and Chapter 3: Document Access.
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Free Chapters from The CSS Anthology: 101 Essential Tips, Tricks & Hacks, 2nd Edition

Three free chapters can be downloaded in pdf format from The CSS Anthology: 101 Essential Tips, Tricks & Hacks, 2nd Edition.
Free chapters are:
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Download the free CSS ebook containing these 3 chapters from here.