An old colleague of me, Gill Cleeren (Together with Kevin Dockx) wrote his first book.  It's a book about Silverlight 4 Data and Services Cookbook.

Over 80 practical recipes for creating rich, data-driven business applications in Silverlight.

Find all the book info and how to order it here: http://www.snowball.be/2010/04/26/My+Book+Released+Silverlight+4+Data+And+Services+Cookbook.aspx

Gill, Congrats with your first book.