It should be possible to receive video streams from standard encoding devices other than Expression Encoder and Smooth streaming where files are streamed. A full standard compliant RTSP/RTP stack that can decode H.264/MPEG-4 would go a long way to make silverlight a viable platform for a universal video player

Plugin load time for LOB forms is very slow, especially on browsers other than IE. Declarative rendering of XAML for forms with hundreds of controls is unacceptably slow.

When a user takes a Silverlight 3 navigation app out of the browser, a number of things are missing that result in an inconsistent user experience. Missing features include:

1. Forward/Back buttons
2. History
3. Favorites
4. Address Bar

To get a better understanding of the missing features read these posts:
http://thinkfirstcodelater.com/blog/?tag=silverlight-browser

To see what a very rough prototype of how these issues could be addressed look at the following project on codeplex:
http://silverlightbrowser.codeplex.com/

LOB applications heavily use MDI functionality to drill-down to specific item like File-->Payments-->Unsettled Bills, etc..

Many users are accustomed to use MDI functionality thanks to Word, Excel, etc and are instantly comfortable with any app that resembles to it.

Office 2007 implements older MDI functionality using new Ribbon control, even that can improve user interaction with SL app.

Silverlight needs to have MDI/Ribbon feature to promote wide scale adoption for LOB applications.

Thanks,
Mahesh.

Mousedown/up isn't good enough

i know that the programmer is able to do Click and Doubleclick himself. But such events should be there by default !

using Mouseup or Mousedown as Click introduce bugs all over the place !

Doubleclick is also needed for better apps.

To be able to access all functions of the framework, I work a lot in the development of control devices and would be very useful for example to control them directly from the serial or USB por. These functions could be available (for the security issues) when install the application in Out of browser mode.

Allowing to show an OpenFileDialog from javascript makes much more easy to implement reach upload expiriences. Just invent something else to secure user interaction.

Something like Doloto, (Download Time Optimizer), a tool that makes pages more responsive by decreasing the initial download size of applications. Doloto is aimed at AJAX; something similar to manage xbap & asset deployment would be great.

Implement Messaging Support?should be able listen to Tibco EMS messages.

Give Silverlight the ability to work with Flow Documents (edit, manipulate) the way you can do in WPF.

Allow adding custom MarkupExtensions for cleaner code.

I would like the rendering of text and images in Silverlight to look as good as in the browser with HTML, WinForms or other windows apps.

Why: It looks sloppy in Silverlight 3 and is unpleasent to read or look particularly for small or bold fonts with dark text on light background.

It's sure improved in SL3 but still looks bad side by side with other programs. I thought text rendering was solved decades ago until SL and WPF broke it.

When something scales or rotates, it pushes other controls out of the way. Like WPF!

Improve the Silverlight WCF stack by providing support for wsHttpBinding and wsDualHttpBinding

A full GPU accelerated 3D engine should be included, something like a fast wrapper for Direct3D or OpenGL (Mac).
Just imagine how a state of the art 3D game would push Silverligt in the market. IMHO it has the potential to overtake Flash's current dominant market position.

This would be hugely useful for a number of scenarios, not just fancy UI reflections. :)

Better troubleshoting and diagnostic tools,
ability to trace client code, pass exceptions from server to client, etc..