Microsoft® Silverlight™ is a cross-browser, cross-platform plug-in for delivering the next generation of .NET based media experiences and rich interactive applications for the Web.

Silverlight offers a flexible programming model that supports AJAX, VB, C#, Python, and Ruby, and integrates with existing Web applications. Silverlight supports fast, cost-effective delivery of high-quality video to all major browsers running on the Mac OS or Windows.

You can see the power of Silverlight from the Showcase.

Requirements: Microsoft Silverlight Runtimes 1.0
Demo: http://silverlight.net/Showcase/
License: License Information