I bought this book and Patent Pending in 24 Hours. The latter was a complete disappointment (read my review of it). This book however, was fairly detailed and answered quite a few questions for me. I am trained as a Graphic Designer. So I was very interested in doing the drawings myself on the computer. While the book focuses on traditional drawings for the most part, the information is still relevant for computer drawings. The book tells you what parts you need to draw and what to leave out. It also talks about how to shade the different elements. Which is one of the major things the examiner uses to differentiate the parts of your invention that connect or are attached. The book also goes into detail about how to label your figures and numbering of parts.
The one thing that did bother me about this book is that more than once they tell you to reference Patent It Yourself for more information. I bought this book because it implies that it will tell you everything you need to know about making patent drawings. I thought it was ridiculous that they spread the information out into their other book as a ploy to make more money. Luckily, there is enough information here to do what you need to do.
Overall I thought the book is a good collection of information. Despite the references to their other book.

I found this book to be excellent. Lot's of information and concisely written. A MUST reference if you are planning to make your own patents. Some good info on CAD drafting software, also.

On the last couple of patent applications I submitted, I ended up doing 90% of the drawings myself because it turned out to be easier than continuously having to correct the mistakes of the draftsman. My attorney said that my drawings just needed to be shaded and cleaned up a bit, and have the legends applied, but otherwise what ended up going into the applications was essentially my drawings with a few more bells and whistles. His draftsman had just put them on a light table and copied them as is. But I still had to pay for the drawings!

This book was able to get me the rest of the way there by detailing the regulations that the USPTO puts on drawings. They're not really difficult, but they ARE specific. Don't be intimidated by them. The very simple drawing style specified by the USPTO is to allow clear reproduction and printing. My attorney charges $295 per figure, and one page can have 2 or 3 figures on it! The last application we submitted had about a dozen figures total. Some of the expense is the work of integrating and describing the drawings, but it is guaranteed to save you money if you do your own drawings. Besides, this ensures that you will be satisfied with the quality and accuracy. Don't forget you can also have the draftsman do the difficult 3-D "Figure 1" bit, and you do the simpler stuff. Like me, I'll bet you'll find it easier than you thought!