The MapPolyline should support the driving direction feature. It should be able to displaying arrows.

The VisualizationLayer does not always show items when the RadMap uses a custom map provider which uses a custom UTM map projection.

Implement a feature that allows the RadUpload control to resume its upload session when interrupted by a connection failure.

Expose an event to fire if the files that should be uploaded are in use by another process.

Support for WebBrowserBrush.

Implement template or properties providing the audio player look when playing audio files. For example: hide the media rectangle when it is not required; provide a way for customizing the videocontrols panel.

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.
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Provide a gradient color picker similar to http://www.markbetz.net/sl/gradient/

"It would be really useful to have a RadComboBox with a RadTreeView.

The combination of RadDropDownButton with a RadTreeView seems to be an insufficient workaround:
- start-up item setup
- sync current item
- IsOpen hack in MVVM
- no validation support - which is a serious drawback
- no edit/search support"

Allow the QAT context menu to be extended

Add support for direct content of ribbon buttons (like using XAML vector graphics instead of images).

Use Matrix3DProjection for 3D transformation

Provide built-in compression.

Ability to distinguish beween types of group headers and apply fixed width to one type of group headers and force the rest of them to calculate their size automatically.

Allow disabling of the FullScreen functionality.

The map navigation buttons will support the functionality like the auto-repeat when a key is pressed.

Change the logic that creates a default unique name for duplicate files. At the moment it is based on a counter and instead we need to consider renaming the file as a "Copy of [fileName]" or "[fileName] - Copy".

The project configuration wizard displays a list of assemblies that we can include or exclude from the current project.
It would be much more useful if this window lists all the different controls and we select the controls we want to use. Currently, we ne

The System.Globalization namespace includes the following Calendar implementations: GregorianCalendar, HebrewCalendar, HijriCalendar, JapaneseCalendar, JulianCalendar, KoreanCalendar, TaiwanCalendar, and ThaiBuddhistCalendar. 

Consider implementing support for custom calendar in RadTimeline and RadTimeBar controls.