Silverlight is about giving the users a first class UX.

I don't think that it's first class to let the user enter a document name each time the download a document.

We have to use ASPX for download until this usability bug is fixed.

Please also make the dialog title writable.

Thanks

Out of browser is fine (SL 4 Beta), but it is also needed in browser so that "3rd party" html content can be incorporated into a Silverlight application (actually a show-stopper for me).

Currently Silverlight 3 is a good platform for 2D casual games but lacks the control of, say, XNA. Porting the 2D XNA API to Silverlight would make it a much better platform for game development (as a separate library). This is definitely possible (see SilverSprite on CodePlex), but official Microsoft support would be much better.

Without having to replace sidebar64.exe (Windows Gadget)

Allow adding custom MarkupExtensions for cleaner code.

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.

Since silverlight 4 now allows accessing OS services through COM, it makes perfect sense to reduce the pain by allowing pinvoke. Mono has proven that this is works across platforms. Not doing this will only make silverlight less appealing for any advanced applications. It should be left upto the application developers to decide whether what they offer is truely platform neutral or for a range of platforms.

Silverlight 4 prints by rasterizing the content to bitmap and sending this bitmap to printer. This has many unpleasant side effects - print jobs are huge, especially on high DPI printers and long documents, printing to PDF or XPS is essentially useless, because the output contains just bitmaps, etc.
Please, implement proper vector printing like WPF, Flash, GDI, Windows Forms etc.

Making Microsoft.Xna.Framework.dll available in Silverlight for Windows Phone makes writing games in Silverlight easier but taking advantage of things like Vector2, Matrix, and SoundEffect makes it harder to share code between Silverlight for Desktop and Silverlight for phone.

Please release a version of Microsoft.Xna.Framework.dll for Silverlight for desktop so that we can share more code and more easily take advantage of XNA based open source libraries like physics engines.

This was marked "completed" for Silverlight 4 but the original request is for "full" keyboard support. There are too many use cases to list here. There are a large number of requests in the forums -- the Silverlight 4 approach gets us closer. Many applications which benefit from full-screen support require keyboard input. One possible solution is to display an "opt-in" message requesting the user's permission to allow keyboard input to be collected.

Currently Silverlight on Windows Phone 7 is based on Silverlight 3 with small bits of Silverlight 4. It would be great to have Silverlight 5 launch simultaneously for desktop PC and as an update for Windows Phone 7.