Today, I received the online newsletter from the Xceed team, who are pretty well known for their awesome Xceed DataGrid for WPF, where they announced the release of the Xceed Upload for Silverlight.
It is a full featured Upload control (like the ASP.NET FileUpload Control), built on Silverlight 2.0 Beta 1, which has cool features like a loading indicator, imagine previewing, multiple file uploading support, and many more.
As far as I know, I don’t think other control vendors have any file upload control, which is very useful in developing enterprise solutions. This is definitely richer and much more interactive alternate to the ASP.NET FileUpload control, as long as your company can afford it 
