Again, Kevin Hoffman does a great job at explaining how to use Silverlight, C# and to program for the Windows Phone 7.

WP7 for iPhone and Android Developers - Introduction to XAML and Silverlight

http://www.silverlightshow.net/items/WP7-for-iPhone-and-Android-Developers-Introduction-to-Xaml-and-Silverlight.aspx

Nicely Done.