Finally, I found a very good Silverlight 3 Site that actually has good training videos and resources (thanks to my colleague Marvin Varela). Go ahead and check MSDev Portal site right now !!! You will find training resources for top cutting edge Microsoft technologies, and if you are into Silverlight, check the Silverlight 3 Series page.
I don't know about you, but since Silverlight 2 release I never found a good, consistent, and integral site for Silverlight training resources. Let's face it, the Silverlight Official site has been struggling to put decent training content on the site. Most of the tutorials and videos are boring, not cool and not very useful in practice. Also it lacked a lot of the Designer+Animator+Developer workflow that makes Silverlight a great developing experience.
Go ahead and check out the site, it will help you, no matter your experience level. It's always good to go back to basics.