I just found the most amazing thing.
At books.google.com, there are many entire books available FOR FREE from one of my favorite publishers, Canon Press.
This link goes to many of them.
The Lord's Service is the best book on worship I've ever read.
Mother Kirk is an excellent orientation to the Church.
Fidelity is a practical guide to purity for men.
Critique of Modern Youth Ministry is what it says, and does it well.
Reforming Marriage is the best marriage book I've read.
Reformed is Not Enough is the best summary of the Federal Vision, in substance, not just the controversy surrounding it.
Trial and Triumph is an excellent church history to read with your children.