Silverlight Announced
It used to be called WPF/e, and now its Silverlight! There are so may good things about Silverlight, included some new funcationality. Silverlight 1.1 now supports the CLR running on all supported platforms. That means you can write C# and VB.Net Silverlight code that will run on a Mac.
Take a look at some nice demos and get more information here: https://silverlight.net