The code to accompany chapter two of Microsoft Windows Communication Foundation-Hands On!, updated for the June 2006 CTP/RC1 release is here: http://www.electronicfiles.net/files/3741/02.zip. 

The June 2006 CTP/RC1 release itself is here: http://www.microsoft.com/downloads/details.aspx?FamilyID=8d09697e-4868-4d8d-a4cf-9b82a2ae542d&DisplayLang=en.