Supporting full-screen mode within Silverlight applications is pretty easy to enable, and offers the ability to provide a nice, immersive user experience. 

To learn more about Silverlight, please read my comprehensive Silverlight announcement post as well as visit the www.silverlight.net community site.

To watch me walkthrough building a Silverlight application from scratch using .NET and Visual Studio "Orcas", please watch this video here.

Hope this helps,

Scott