Microsoft released Silver Light 4 Release Candidate
You can read the new features here and
download the required tools
- Silverlight 4 Tools for Visual Studio 2010
- Windows Runtime or Mac Runtime
- Expression Blend 4 Beta
- Silverlight Toolkit
- WCF RIA Services
- Online Silverlight 4 Documentation
- Offline CHM help Silverlight 4Documentation file download
Here and Here is getting started documents
Silverlight 4 Training Course
The Silverlight 4 Training Course includes a whitepaper explaining all of the new Silverlight 4 RC features, several hands-on-labs that explain the features, and a 8 unit course for building business applications with Silverlight 4. The business applications course includes 8 modules with extensive hands on labs as well as 25 accompanying videos that walk you through key aspects of building a business application with Silverlight. Key aspects in this course are working with numerous sandboxed and elevated out of browser features, the new RichTextBox control, implicit styling, webcam, drag and drop, multi touch, validation, authentication, MEF, WCF RIA Services, right mouse click, and much more!
Read more and get the Silverlight 4 Training Course here
More resources here