Good tutorial for Silverlight with WCF and Linq To Sql

Part of Jeff Blankenburg's "31 Days of Silveright".  I went through this tutorial to get myself refreshed on Silveright.  It's been about 6 months since I've done a SL2 project and needed refreshing.

http://jeffblankenburg.com/2009/07/day-7-using-wcf-web-services-with.aspx