Microsoft Silverlight

not for designers only but for developers too
Microsoft Silverlight
Microsoft Silverlight is a cross-browser, cross-platform plugin 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 JavaScript, .NET, and other languages.

As a first step, check out the Getting Started with Silverlight Video.

http://silverlight.net/learn/slVideo.aspx?video=http://download.microsoft.com/download/5/9/8/5985f834-b3ea-459b-98ba-0aede5bc653a/ScuttGu_Silverlight_Demo.wmv

Learn Links

http://silverlight.net/learn/learnvideos.aspx