.NET 4 RC Parallel Programming Samples Parallel LINQ (PLINQ), the Task Parallel Library (TPL), thread-safe collections, and coordination and synchronization data structures samples.

New Articles on MSDN: ClickOnce, Office 2007 Business Apps These in depth articles provide details about ClickOnce and Office 2007 development.

Understanding the “Dynamic” and “Object” Keywords in C# 4.0 Microsoft's Alexandra Rusina explains the subtle difference between the “dynamic” and “object” keywords.

Constraints are not part of the signature Eric's intriguing post on generic constraints and overload resolution generates some heated discussion.

Building a LINQ Provider Learn how to build a simple IQueryable provider similar to the LINQ to SQL provider.

Tuples, Anonymous Types, and Concrete Types C# book author Bill Wagner writes on the new C# 4.0 tuples type.

Getting Information about Your Code with Expression Trees Learn how you can use expression trees in C# 3.0 or later to get information about objects, types, and members.