I've been hearing good things about Sproul's latest book on the WCF, Truths we Confess. Only the first of 3 volumes has been published so far. But Sproul usually writes for the laymen.

Also, Shaw on the WCF mentioned above is pretty good. Not too complicated for laymen to work through.

__________________
Patrick
MDiv, RTS Jackson
Pastor, Grace Presbyterian Church (OPC), Lisbon, NY

"He does well, that discourses of Christ; but he does infinitely better, that by experimental knowledge, feeds and lives on Christ." Thomas Brooks.
"Let us not please ourselves that we have deep understandings, but let us shew our understandings by our practice." Richard Sibbes