Silverlight

Silverlight is a cross-browser, cross-platform and cross-device browser plug-in that helps companies design, develop and deliver applications and experiences on the Web. Silverlight enables a new class of rich, secure and scalable cross-platform experiences.

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.

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