No, the book is legit, it keeps you informed of tax laws that you may or may not have known about. I got the whole 900 page book free about a year ago (another hot deal) and I didn't learn anything I didn't already know. But it was worth looking at, and it documented a lot of tax tricks that can save you money if you qualify for them.
In other words, it's legit. But you'd be surprised how much you can save on your taxes through totally legitimate deductions.