Andy Beaulieu is happy to find out that Silverlight 4 introduces GPU Acceleration to Perspective 3D Transforms.
Perspective 3D Transforms were originally introduced in Silverlight 3, and allow 2D visual elements to be rotated in 3D space.[...] The problem in Silverlight 3 was that PlaneProjection’s were rendered using software instead of the video card (GPU), so you could quickly peg the CPU if you overused this transform effect.