Silverlight 5 is finally gone RTW and is available for download starting today. New features in Silverlight 5 include Hardware Decode of H.264 media, which provides a significant performance improvement with decoding of unprotected content using the GPU; Postscript Vector Printing to improve output quality and file size; and an improved graphics stack with 3D support that uses the XNA API on the Windows platform to gain low-level access to the GPU for drawing vertex shaders and low-level 3D primitives.
Head on over to http://go.microsoft.com/fwlink/?LinkId=149156 and download it now!