It looks like Microsoft has just raised stakes in its "war on Flash". Silverlight,
formely known as WPFe is to provide a Dynamic Language Runtime, which will provide a
shared set of language services such as a dynamic type system, fast dynamic dispatch,
smart code generation, and a hosting API. Languages to support this platform
include JavaScript, C#, VB, Ruby, Python, and more.
Check out this post by Somasegar's blog:
http://blogs.msdn.com/somasegar/archive/2007/04/30/mix-07-silverlight-shines-brighter.aspx