Microsoft Silverlight is one of the hottest technology that ever produce on web. It is a Microsoft answers to macro media flash and action script. You can develope rich web user interace and dashing site with the use of Microsoft silver light and asp.net.
I have found a great link that contains lots of silverlight resources and tutorial links.
You can find almost all information and links about silver light from here.
http://www.plentyofcode.com/2007/07/what-is-microsoft-silverlight.html