Microsoft announced Silverlight, a XAML based platform with mini .NET CLR platform included. With this product it appears that Microsoft is targeting both web animations and rich experience web applications.
Microsoft affirmed that Silverlight will be cross platform framework available for IE, Firefox, Safari on both Windows and MAC OSX. Anyway, only the time will tell if this was only a marketing trick to help competing with Adobe Flash/Flex platform or Microsoft is indeed honoring its statements.
To find out more visit Silverlight site at http://www.silverlight.net/ and in case you are a developer don’t miss the getting started video.