You may have already seen the Silverlight Blueprints for SharePoint but you may not have seen that you can now find the project on CodePlex, and that there is a new update which includes information on Silverlight 2 Beta 2 as well as well as some great samples such as custom navigation, slider controls, media player information,and such.  You can find the project (and contribute to it as well if you like) at http://www.codeplex.com/SL4SP.