One of the questions I've seen a few people ask is "how can you implement full screen-mode when building Silverlight applications using .NET?"  The good news is that the answer is actually pretty easy:

1) First add an input driven event handler to your application (for example: a mouse down or keyboard event handler).  For security reasons Silverlight doesn't allow developers to switch an application into full-screen mode on first application load (you don't want an application to spoof you).  So you'll instead need to trigger full-screen mode in response to a user action.

2) Within your input event handler set the BrowserHost.IsFullScreen property to true (note: the BrowserHost class lives within the System.Windows.Interop namespace).  This will cause Silverlight to switch into full screen mode.  Setting this property to false will return it back to normal browser mode.