Yesterday Microsoft released the first version of the Silverlight Extended controls suite on Codeplex.
This control suite contains a number of special controls that are now available for the public to download and use in their own projects.
an example of what kind of controls are included in the toolkit:
On the codeplex site there are online demos of all controls which are included in the toolkit and the controls are also documented in the wiki on the page.
Example of how the Treeview looks and how you use it:
Example of the AutoCompleteBox and how to use it in your xaml code:
I really think Microsoft did a great job at offering these controls to the community and it will make developing in silverlight easier for everyone.
I liked the Charting part the most and i really look forward in using that in my projects in the future. Just look at how nice these controls look and how easy you can fit them into your project:
Geert van der Cruijsen