The Silverlight Games 101 is focuessed entirely on game-making in Silverlight 2 (as was to be expected from its title). The latest posts is about A simple Silverlight game particle system:

Particles are a key part of game programming. When it comes to explosions, smoke effects, and many other types of effects, it is often easier and gives a better effect to compose the full effect out of several smaller particles. These particles can vary in velocity, position, color, and opacity, among other properties, based on the effect desired. In some games, the particles need to behave according to the game physics, such as gravity. Particles typically have a short life span and then disappear. Since there can be a large amount of particles being created and destroyed on a regular basis, a particle engine is typically employed to manage them.