Tutorials/samples to try

http://silverlightedweb.blogspot.com/2010/03/creating-wcf-proxy-without-reference.html

http://prodinner.codeplex.com/

Windows Phone "On your way home" app from MSDN magazine (March 2012) "Create a Continuous Client Using Portable Class Libraries"

http://blogs.technet.com/b/vedant/archive/2009/08/07/using-silverlight-in-sharepoint-2007.aspx - see links to videos and tutorials

http://msmvps.com/blogs/deborahk/archive/2010/07/19/the-world-s-simplest-silverlight-ria-poco-example.aspx