DevX published a series of three articles that explore the built-in support for standard design patterns in ASP.NET Design Patterns for ASP.NET Developers, Part 1: Basic Patterns Design Patterns for ASP.NET Developers, Part 2: Custom Controller Patterns Design Patterns for ASP.NET Developers, Part 3: Advanced Patterns...
A good article on JSON in MSDN site http://msdn2.microsoft.com/