The UploadFinished event is not fired when file's size is bigger than the Upload.BufferSize and the Upload failed.

Add support for different upload services - WCF, etc. Ability to use the RadUpload with a Linux server side.

--- feeedback below ---
The reason is security and asynchronous implementation + remove the processing to a service instead of the silverlight app.

security: Using the filestream attribute in SQL Server 2008 the connection to the database is to be made by windows authentication. Therefor we created a functional windows account that runs the service and is responsible for the connection to the database server.
---/----------

Allow dragging messages from Outlook to the RadUploadDropPanel

Provide built-in compression.

I think it would be great if we could have feature parity on this in WPF as uploading file is a rather common requirement in line of business applications. I'm working on migrating our product referential data management application to WPF from asp.net / javascript and i find myself having to roll my own upload for the time being.

Allow end user to choose if the file should be overwritten

Implement Resume/AutoResume on upload error.

The current error reporting UI is not very UX. We need to improve it.

Add properties for customizing the upload appearance to allow the upload too look like an ordinary single file upload box.