Billy Hollis: a walkthrough basic WPF/Silverlight layout + XAML concepts
DotNetRocksTV (dnrTV) just posted a discussion (with video of action in VS) with Billy Hollis that goes through a number of concepts in WPF/Silverlight layout (Grid, StackPanel, size to content), ContentControl (Button, ToolTip), and XAML (attached properties, property-elements).
Very helpful for people new to WPF/Silverlight: Billy Hollis: XAML for Developers Part One