Microsoft has released Silverlight 3, after being in beta testing since March 2009.
Silverlight 3.0 includes over 50 new features, including graphic processing unit (GPU) acceleration, 3D support, H.264 video support and out-of-the-browser capabilities to Silverlight.
A full list of features can be read on the Silverlight website. Silverlight 3 is available for Windows and Mac OS X today.