Code samples for Silverlight using C# and XAML:

Monotone

A graphics demo in XAML and C# with MP3 audio.

Start here. Source here.

Digger

Silverlight version of a Boulderdash game. Use cursor keys, ESC to restart, SPACE to jump to the next level.

Start here.

Inplay

An in-page audio and video player with position and volume control.

Start here. Source here.