http://oryxdev.com/en/blogs/ahmed/archive/2009/06/20/always-responsive-multitier-solutions-with-net-3-5-sp1-wcf-wpf.aspxThis a great whitepaper on “A Services-Layer and Smart Client for monitoring ship-navigation” that shows real-world usage of WCF and WPF and design patterns.   You can find it here (Save Target As..)enCommunityServer 2008 (Build: 30417.1769)