Jeff Smith has a series on the 4th Commandment and the Christian Sabbath;
For the full, detailed series (18 lectures which gets into why the 10 Commandments, as a whole, are still abiding) see sermons 27-44 here, or below:
Jeff Smith has been a fulltime pastor since 1990 and began ministering in Covenant Reformed Baptist Church, Easley, South Carolina, as a church plant in 1994. He holds a Bachelor of Arts degree (B.A.) in Religion from Gardner Webb College and a Master of Divinity degree (M.Div.) from Southwestern Baptist Theological Seminary. He also serves on the faculty of Reformed Baptist Seminary and as a contributor to the Reformed Baptist Theological Review. He and his wife Kelly have five children, three boys and two girls. The first two born in 1991 (twins) and the last in 2003. As of September 2009 Pastor Smith took up responsibilities as a pastor of Emmanuel Baptist Church, Coconut Creek Florida where he presently labors.
And for some reading on this topic: