Moonlight 1.0 is out. Not sure what Moonlight is? As described at http://www.mono-project.com/Moonlight :
Moonlight is an open source implementation of Silverlight (http://silverlight.net), primarily for Linux and other Unix/X11 based operating systems. In September of 2007, Microsoft and Novell announced a technical collaboration that includes access to Microsoft's test suites for Silverlight and the distribution of a Media Pack for Linux users that will contain licensed media codecs for video and audio.
No more excuses. Start coding!