Nokia has announced that Silverlight from Microsoft will be coming to them soon, there are plans for it to be brought into Windows Mobile.
It will be aptly named Silverlight 1.0 for Mobile and they are hoping that it will be available in the 2nd quarter of the year, it will roughly have the same time line as the S60 version of the plugin.
The first version is the only one that will be able to support Silverlight 1.0, even though the 2.0 has been released already for PC.