Silverlight 3 released with major Improvements

Silverlight by Microsoft, helps you create rich web applications that run on Mac OS, Windows, and Linux.

Silverlight 3 introduces major media enhancements, out of browser support allowing Web applications to work on the desktop; significant graphics improvements including perspective 3D graphics support, GPU acceleration and H.264 video support; and many features to improve RIA development productivity.

To fully integrate all the .NET developer tools, Visual Studio 2008, Visual Studio 2010 and Visual Web Developer Express support a fully editable and interactive designer for Silverlight.

New features in Silverlight 3 include:

• Support for Higher Quality Video & Audio
• Empowering Richer Experiences
• Improving Rich Internet Application Productivity
• Enhanced Data Support
• Improved performance
• Out of Browser Capabilities

See detailed list here