Silverlight 4.0 released with a bunch of new features

New features:

* XAP Signing : User cannot unpack zap files any more !!
* Custom window chrome for trusted applications
* Pinned full-screen mode : can view application in full screen mode , even if it is hosted in a browser.
* WCF RIA Services Toolkit
* ContextMenu control : right click and do the thing you want :-)
* SLLauncher silent installs

Enhanced features:
* RichTextBox improvements
* WebBrowser control
* Printing API enhancements
* Native automation (COM interop)
* Language/Script support
* Networking and Sockets
* User consent dialog on webcam/clipboard/etc.

more information available @ http://www.microsoft.com/silverlight/