Microsoft Silverlight has help many businesses to create rich web applications. If you already a .Net developer and want to get yourself up to speed on Silverlight, I recommend that you get David Yack’s new book, Silverlight 3 Jumpstart.
This book is not like the references books, it focused on the key parts of Silverlight that are relevant for business application developers. This book is just little over 200 pages, you can get through the entire book pretty quick. The list price of the book is $39.99. If you like to get more information, just visit the book’s website (http://www.silverlightjumpstart.com/).