Moonlight, an open source implementation of Microsoft Silverlight for Unix systems, is now available in both Silverlight v1.o and 2.0 builds.  Silverlight, while it still has a long way to go to become as widely adapted as Adobe’s Flash, is leading the charge for Microsoft to become a more open eco-system for development.  Moonlight is not a Microsoft project, but Microsoft has been working together with Mono,  an open source project sponsored by Novell, to develop and run .Net client and server applications on Linux, Solaris, Mac OS X, Windows, and Unix, to make a Linux version of Silverlight happen.

Source:→ Microsoft