Mercury Particle Engine is a 2D particle system for Microsofts XNA Framework. It allows developers to add impressive visual effects to their Windows & XBox360 games with minimum effort.

Gamedev.net is the leading resource for game developers, featuring daily news updates, over 1500 featured articles and tutorials, and the most active game development forums anywhere!

Developer blog about XNA, C#, Xbox 360, and more. Great article on creating a game engine for XNA here.

Particle Wars Game with source.

Catalin Zima's XNA and HLSL Blog. Good tutorials, examples and articles here.

An XNA community where members can view or download various articles, tutorials, and sample code projects.

DPSF - Dynamic Particle System Framework. Create custom particle systems in XNA quickly and easily.

Tutorials and articles on XNA | C# | .NET | DirectX

Nuclex is dedicated to make game programming in .NET a reality. We provide tutorials, code snippets and technical articles on game creation using Microsoft's XNA framework and Open Source class libraries.