Silverlight 1.0 on Microsoft Update and WSUS
Silverlight 1.0 is now available to WSUS administrators for enterprise deployments as well as to Microsoft Update consumers.
IT administrators, you now have the ability to deploy Silverlight across your enterprise using the standard deployment tools you already use. Consumers also have the option of installing Silverlight through the familiar Microsoft Update site. Silverlight 1.0 also will be available from the Microsoft Update Catalog.
Here's the official word: