It would greatly help this book if it had tabs or some other way to help you index into the book. For example, if I want to look up an instruction, I open the book somewhere near the front 1/4 and spin the pages until I see the tables for the instruction set. Ah, but then I have to make sure I'm looking at the correct instruction set (low, mid, 17xx, 18xx) by going to the first page of the table to see its heading (the editor should emphasize on each page to which instruction set we are looking at. I have had to add mini Post-It(TM) notes to each section to help me index faster.
Coverage of the instruction sets are lacking (one page should be dedicated to each instruction and examples for the use of that instruction should be given). Don't make me turn the book side-ways. Put separation lines between each instruction if you can't put each instruction on a separate page.
I think the author should think more about what kind of information people would reference most. My feeling is that they would reference the instruction set and details about the instruction set the most. So that is where he should spend the most time getting a good format.
Where would I go to look for IC pin identification? The data sheet of course; not this book. Where would I go to see examples of how to hook up an LCD. Perhaps to the Programming and Customizing" book, but not in a reference book.
One last comment about the size and shape. I would rather see a book that's 6"x4" and 1/4" deep rather than 3"x2" and 1" deep. The current size and shape require multiple pages to cover topics, make indexing into the book harder because there are more pages to spin through, and the book doesn't stay open unless you turn it over. (how can I refer to the text and type on my PC at the same time if the book is face down?)
I, personally, am going to look on the web for a better reference document that is easier to use. I wish one could get their money back for books that don't meet your expectations. I usually get books through inter-library loan and check it out to see it's good enough to purchase. I guess I should have done that with this book.