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G.I. Williamson has a study guide to the HC that is pretty decent.
This is the Hoeksema sermon book on the Heidelberg I referenced.I don't have it yet, but I'd like to see Herman Hoeksema's Triple Knowledge Amazon.com: The Triple Knowledge: An Exposition of the Heidelberg Catechism (3 Volume Set) (9780916206055): Herman Hoeksema: Books
Several collections of sermons where a minister preached through the Heidelberg are in print. Some of these provide a lot of insight into the Catechism.