The Evolution Of LINQ And Its Impact On The Design Of C#

C# PM Anson Horton explains the relationship between LINQ and the new features in CSharp 3.0 such as extension methods and lambda expresssions.

This article discusses:
C# and LINQ
The evolution of LINQ
SQL querying from code

Contents
Lambda Expressions
Extension Methods
Anonymous Types
Implicitly Typed Local Variables
Object Initializers
Query Expressions

Anonymous Types In Orcas Article

Anonymous types are a convenient language feature that enable developers to concisely define inline CLR types within code, without having to explicitly provide a formal class declaration of the type. Although they can be used in lots of scenarios, there are particularly useful when querying and transforming/shaping data with LINQ.

Scott Guthrie has a nice article on his blog that covers anonymous types

Here are the sections:
What are Anonymous Types
Anonymous Type Example
Understanding the Var Keyword
Declaring Anonymous Types
Using Anonymous Types for Hierarchical Shaping
Data Binding Anonymous Types
Summary

Read the article here: http://weblogs.asp.net/scottgu/archive/2007/05/15/new-orcas-language-feature-anonymous-types.aspx