Moonlight 2 Preview
Moonlight, the Linux version of Silverlight, has produced its first preview release of Moonlight 2. This Moonlight 2 preview covers a subset of the new features in Silverlight 2, and looks to mostly focus on controls and media playback. There are also a few features from Silverlight 3, such as out of browser support.
You can get the Moonlight 2 preview as either binaries or source code.