Silverlight Tip of the Day #42: How to Create a Web Service for your Silverlight App

http://blogs.silverlight.net/blogs/msnow/archive/2008/09/17/silverlight-tip-of-the-day-42-how-to-create-a-web-service-for-your-silverlight-app.aspx

Consuming WCF Services in Silverlight 3

http://visualstudiomagazine.com/articles/2009/06/22/consuming-wcf-services-in-silverlight-3.aspx