Lots of great illustrations, but I wish the emphasis was less on the finest examples of styles, and more on common examples. For vernacular houses, try "A Field Guide to American Houses" by Virginia and Lee McAlister.
This is a reference book really, not something you read through cover to cover. It is an excellent guide for identifying American residential architectural styles.
This book is well organized, with well reproduced photos, layout plans and drawings. An excellent coffee table book that is a great reference work as well. As another reviewer pointed out, this book generally shows best of class, so I would recommend adding a book with more emphasis on average homes like A Field Guide to American Houses or a similar reference work.
Similar to "Houses of Worship", this looks like a self-published book. The sheer amount of photographs is impressive and a useful guidebook for anyone.