I have added some new posts on Silverlight 3:
Printing in Silverlight 3 with WriteableBitmap – Shows how to use the new WriteableBitmap class to “print” the Silverlight UI or take a screenshot.
Silverlight 3: HitTest with WriteableBitmap - Shows how to do pixel-perfect collision detection between Raster (Image) and Vector (XAML) elements in Silverlight.
Physics Helper 3: Coming Soon! - Shows the soon-to-be-released Physics Helper 3, with support for Behaviors in Blend.
And I have updated the older Silverlight 3 Beta posts so everything is compatible:
Silverlight 3: GPU Acceleration and Bitmap Caching – This is the most exciting feature of Silverlight 3, IMHO!
Silverlight 3: Pixel Shaders and Effects - See how you can create new effects using HLSL.
Silverlight 3: PlaneProjection with Storyboard - Looks at how to display and animate the new 3D Perspective projection.
INFO AND CODE