There's a few books I've worked on - some I've authored myself, to others I've contributed. On this page, you can find an overview.
Silverlight 5 Data and Services Cookbook (release date: February 2012): the follow-up to the Silverlight 4 Data and Services Cookbook, over 115 practical recipes for creating Silverlight (5), WCF RIA Services and Windows Phone applications.
Silverlight 4 Data and Services Cookbook (release date: April 2011): over 80 practical recipes for creating rich, data-driven business applications in Silverlight 3 & 4.
Silverlight 4 Data and Services Cookbook - LITE edition (links to Packt Publishing site) (release date: May 2011): 17 recipes from the Silverlight 4 Data and Services Cookbook.
Managing Data and Media in Silverlight 4 (release date: November 2011): a mashup of recipes from Packt's bestselling Silverlight books, including recipes from my Silverlight 4 Data and Services Cookbook
Next to these books, some of my articles have been published as e-books by SilverlightShow.
Authorization in Silverlight
Working with collections in WCF RIA Services
Silverlight WCF RIA Services: strategies for handling your domain context
Caching of, in, and around your Silverlight application