Mikes Taulty and Ormond have put together a bunch of 50 screencasts on Silverlight 2 Beta 1 dealing with a range of topics inc.
"Hello World" with VS and Blend
Anatomy of a Silverlight Application
The <asp:Silverlight> Control
Controls - What's In the Box?
Why Controls have a Content Property
Width, Height, Margin, Padding, Alignment
Laying out Content with Grid
How To Use a GridSplitter
Laying out Content with StackPanel
Laying out Content with Canvas
Embedding Video and Audio
Go to his blog here: http://mtaulty.com/CommunityServer/blogs/mike_taultys_blog/archive/2008/05/15/10402.aspx
Or directly to the screencasts here: http://www.miketaulty.com/SLVideos.html
Have fun!