"The New Yankee Workshop" embodies the same philosophy and techniques espoused by Norm Abrams in the television show by the same name. If you love the show, you will love the book. It is full of projects inspired by the clean lines and straight-forward elegance found in classic Shaker designs. The step-by-step instructions are generally well-written, with lots of illustrations and photography.
Unfortunately, Mr. Abram's techniques depend entirely too much on machine methods of joinery for my taste, and completely disregard the relationship that a Shaker craftsperson developed with the wood and his Maker as the furniture was being constructed. (Only two hand tools are in evidence in the book: a chisel and a screwdriver.) I believe this dependence on machinery puts his construction methods out of reach for most amateur craftspeople, and the quality of the resulting product is certainly not what I would want from a professional.
Furthermore, the book is marred by senseless violations of good woodworking practice. His construction methods are heavily dependent on drywall screws, which are even used to fastened table-tops to their bases. This he does without making any provision for wood movement, so the furniture made in this way is at risk for cracking and warping. Where he uses pegged mortise and tenon joinery, he simply drills holes into the assembled parts, rather than taking the opportunity to offset the holes and draw the joint tightly together. A few of the photographs seem to show safety violations: operating power tools while wearing rings; no guards, pushsticks or featherboards in evidence; no hearing protection; fingers in precarious positions; the use of a dado blade on a radial arm saw; and making a plunge cut on a table saw without the use of a stop block.
So, if you understand good woodworking practice, and you want to knock together some Shaker-like furniture quickly, you might get some useful inspiration from this book. However, if you are this far along as a woodworker, you'll find more inspiration, more sound woodworking practice, and more authentically Shaker projects in "How to Build Shaker Furniture" by Thomas Moser. And if you are looking for something that is more of a project book, suitable for serious woodworkers of any level, try "Making Elegant Gifts from Wood" by Kerry Pierce, which has many lovely pieces, some of which are Shaker-inspired.
If you do buy The New Yankee Workshop, I would completely disregard his recommendations on finishing. Again, he over-emphasizes the use of machines in the finishing process (even a random-orbit sander, which he doesn't mention, will leave surface marks that will be highlighted by stain and finish), and he never discusses the use of shellac or oil finishes. For good finishing advice, see Bob Flexner's book, "Understanding Wood Finishing: How to Select and Apply the Right Finish".