You can create Silverlight Application (C#) where you have C# code-behind XAML files.

I would also like to have Silverlight Application (F#) where you have F# code-behind XAML files.

F-Sharp is very powerful language but I would like to see more tools supporting it.

could the default view of Silverlight controls assume the look and feel of the operating system without using styles. ASP.NET controls do and this would help 'blend' (no pun intended) the two 'out of the box'.

like in WPF

Can't find whether v3 added this or not, but it looks like it still downgrades to stereo?

Currently binding the TabControl to a list of custom objects fails as it tries to cast each object to a TabItem. It should override PrepareContainerForItemOverride to wrap the custom objects

Add Bitmap to byte[] and byte[] to Bitmap conversion functions.

When you draw a Line, Path, Font, Image, there is anti-aliasing set by default in Silverlight. It is not possible to disable anti-aliasing. This would be useful for scenarios where you want exact pixel rendering without anti-aliasing artifacts.

Silverlight currently has uneven support for pressure sensitive graphics tablets. Most PC graphics tablets do not return pressure information and the feature is completely broken on MacOSX.

In contrast, WPF provides a very rich tablet API and supports all "wintab.dll" tablets.

We are aware that for Canvas's of width > 33000 we face lot of layouting issues.
It would be really useful if Virtualization can be enabled for all panels (here Canvas) and not only just have a VirtualizationStackPanel

Thanks!
Abhik

The RichTextBox misses the FontSource Property itself.
Other text showing classes do not have it, too like Run, Paragraph, Inline.

We need to set custom fonts! Updating some referenced assembly is not option!

Update the ScrollViewer so it resembles the scrolling capabilities of every browser:

- The scrollbar moves automatically when UIElements are focused
- It handles MouseWheel events automatically
- It offers events that the ScrollBar it uses provides
- It provides a MouseWheel event
- The mousewheel speed is configurable

i.e Integration to Scanners, Biometric devices etc.

Ability to run this tool and "profile" your Silverlight application to view memory usage/leaks

Support SPDIF audio passthrough to HDMI to enable silverlight to pass through DTS/AC3/DD 5.1 or higher streams. No reason we should be downmixing high end audio to stereo anymore

Add all the features of Trace to Silverlight
http://msdn.microsoft.com/en-us/library/system.diagnostics.trace.aspx

Drag and Drop code needs to move up the quality band ladder -- and making ListBoxDragDropTarget etc work in ChildWindows and Popups would go a long way.