Silverlight ASP.NET control: AsyncFileUpload
Wilco Bauwer answered to one good thing about Silverlight 1.1 which make me thinking adopting this technology:
One of the things people have been asking for, particularly since AJAX became popular, is being able to asynchronously upload files. Silverlight 1.1 contains the building blocks to make this possible. I've written an ASP.NET control to demonstrate this feature as an end-to-end scenario. Please note that this feature is just a prototype. As you will see in the source code comments, there is plenty of room for improvement and polishing.