Two Silverlight sites to see
Here is a first nice site for those who are working with Silverlight : Project Rosetta.
"Project Rosetta is a site dedicated to helping designers and developers build applications in Silverlight while taking advantage of skills they already know.
Each article on the site will focus on one technology, and through multiple lessons, demonstrate how existing knowledge and skills can be transferred to another technology. Articles will include assets and source code and show a direct comparison between accomplishing the same task in each technology."
A second Silverlight site, more for programmers: Silverlight Programming, Games and Demos with Source Code.